~tormodvolden/ubuntu/karmic/laptop-mode-tools/dupl-hook : revision 6

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

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<title>Laptop Mode / Laptop Mode Tools FAQ</title>

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<body>

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Return to the <a href="../index.html">Laptop Mode home page</a>, the

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<a href="index.html">Laptop Mode Tools home page</a> or to

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<a href="../../index.html">Bart Samwel's home page</a>.<br>

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Laptop Mode and Laptop Mode Tools FAQ

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</h1>

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<br>

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1. Things You Might Want To Know

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</h2>

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<br>

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Linux Journal article

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</h3>

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<br>

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There's an article in the Linux Journal September 2004 issue.

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It can be found online at <a href="http://www.linuxjournal.com/article/7539">http://www.linuxjournal.com/article/7539</a>.

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It's not really up-to-date anymore BTW. The most important conclusion from the

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article is that it doesn't really pay to increase the spun-down time over a

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minute. I often get mails in which people tell me that they want to go up to

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one hour or more without disk activity. This is nice for noise reduction purposes,

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but not for saving power.<br>

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<br>

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FOSDEM 2006 presentation

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</h3>

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<br>

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I did a talk on power saving, Laptop Mode and the Laptop Mode Tools at FOSDEM

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2006. A pdf version of the presentation can be downloaded

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<br>

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Spinning Down May Kill Hard Drives

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</h3>

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<br>

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Desktop hard drives are usually rated for only 40,000-50,000 spinups,

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and one spinup every 10 minutes will kill your 40,000-spinup HD in 277 days.

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So this is NOT recommended for server use, unless you increase the spinup

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interval dramatically, to say once every hour or two. Laptop hard drives are

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usually rated for around 300,000 spinups, so those will last about 2083 days or

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6 years if you have them powered on 24-7.<br>

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<br>

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If my machine crashes or runs out of power, will I lose all my work?

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</h3>

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<br>

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If you have laptop mode enabled and your machine crashes, then you will lose up

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to MAX_LOST_WORK_SECONDS seconds of work. If you really need to have something

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written to disk, issue the "sync" command. If you have laptop mode enabled

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and your machine runs out of power, you will not lose as much work (provided

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you have an ACPI laptop, as most current PC laptops are) because laptop mode

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is automatically disabled when the battery almost runs out.<br>

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<br>

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2. Relationship with Other Packages

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</h2>

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<br>

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What does all this have to do with Smart Spindown?

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</h3>

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<br>

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Nothing really. You use Smart Spindown if your hard drive can't spin

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down by itself, or if you're irritated by repeated spindown attempts

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while you're actually actively using the computer and don't want

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spindowns at all. It's not well-integrated with Laptop Mode Tools and

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it isn't maintained at the moment, so I'd advise against using it. :)<br>

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<br>

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What is the relationship between Laptop Mode Tools and the script

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in the kernel documentation?

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</h3>

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<br>

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Laptop Mode Tools is a fork of the script in the kernel documentation.

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The script in the kernel documentation is currently pretty much

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unmaintained AFAIK, so I don't recommend using it.<br>

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<br>

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What is the relationship between the Ubuntu package "laptop-mode"

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and the Debian package "laptop-mode-tools"?

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</h3>

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<br>

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There is a big thread about this on ubuntuforums,

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<a href="http://ubuntuforums.org/showthread.php?t=36976">http://ubuntuforums.org/showthread.php?t=36976</a>

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. Ubuntu has a rather outdated package for controlling

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laptop mode, based on the aforementioned kernel documentation script.

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Laptop mode tools basically is a much more recent version of the same

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code. Ubuntu apparently also has laptop-mode-tools available, so I

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advise you to use this package instead of laptop-mode. If it's not in

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the Ubuntu repository, you can download it from a Debian apt source or

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from the laptop mode tools homepage.<br>

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<br>

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How does Laptop Mode Tools relate to noflushd?

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</h3>

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<br>

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It doesn't. Don't install both together. Noflushd does the same thing for

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your disks as laptop mode tools if you don't run a journaling filesystem

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such as ext3, ReiserFS or XFS. If you do, Laptop Mode Tools is currently your

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only option.<br>

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<br>

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3. Is Laptop Mode Enabled?

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</h2>

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<br>

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How do I check if laptop mode is enabled?

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</h3>

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<br>

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Do <span style="font-family: monospace;">cat /proc/sys/vm/laptop_mode</span>.

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If it contains a nonzero value, then laptop mode is enabled, if it says

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0, then it isn't.<br>

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<br>

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What's <span style="font-family: monospace;">/var/run/laptop-mode-enabled</span>

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got to do with things?

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</h3>

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<br>

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Well, this file is created and destroyed by the

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<span style="font-family: monospace;">laptop-mode</span>

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init script to enable/disable laptop mode activity. If this file is not present,

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then laptop mode tools will not do a thing except disable itself, even when you

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unplug your computer from the mains.<br>

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<br>

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And what about <span style="font-family: monospace;">/etc/default/laptop-mode</span>?

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</h3>

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<br>

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That's only supported for backward compatibility with the Ubuntu <span

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style="font-family: monospace;">laptop-mode</span> package. It

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contains a setting using which you can enable or disable laptop mode

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entirely.<br>

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<br>

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4. Configuration Questions / Issues

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</h2>

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<br>

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Can I force laptop mode on/off?

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</h3>

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<br>

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Yes, kind of. If you want to manually control laptop mode, you need to set all ENABLE_LAPTOP_MODE_* to 1, and then control laptop mode by manually calling the <span style="font-style: italic;">/etc/init.d/laptop-mode</span> script with the "start" and "stop" arguments.<br>

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<br>

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Note that the <span style="font-style: italic;">/usr/sbin/laptop_mode</span> command does not support the "start" and "stop" commands anymore. These commands interfere with the low-battery detection code, and they default to "auto" for that reason. This design flaw will be corrected by the 2.x major release, which will feature a profile-based configuration system that will allow manual profile switching without interfering with the low-battery detection code.<br>

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<br>

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I have two hard drives, can I configure Laptop Mode to affect only

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one of them?

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</h3>

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<br>

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Set HD="/dev/hdX /dev/hdY" in <span style="font-style: italic;">/etc/laptop-mode/laptop-mode.conf</span>,

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where /dev/hdX and /dev/hdY are the device names that you want laptop

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mode to affect. This doesn't quite work though: the kernel switch

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(which delays all writes) doesn't discriminate between drives. You can

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also limit which partitions are affected by the remounting, using the

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PARTITIONS configuration setting, but again, this doesn't fully

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disable laptop mode for the other partitions.<br>

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<br>

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I set PARTITIONS and now it doesn't work anymore

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<span style="font-style: italic;">at all</span>.

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</h3>

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<br>

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You have to include the default partitions (the partitions of the

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drives listed in the HD configuration setting) as well. In version 1.06

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and higher you can use the "auto" keyword to

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indicate "and remount all of the default ones as well". "Default" here

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means "partitions that contain the device name of a hard drive in HD",

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i.e. if your partition is /dev/hda3 and you have HD=/dev/hda, then

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/dev/hda3 is part of the default partitions, but if it is aptly named

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/dev/hdx7 then it isn't. :)<br>

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<br>

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I set REMOUNT_PARTITIONS to "/ /mnt /usr" and it doesn't work.

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</h3>

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<br>

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You have to include the<span style="font-style: italic;"> </span>partitions'

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<span style="font-style: italic;">devices</span>, not their mount

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points. So you should list things like "/dev/hda2 /dev/hdb1". If you're

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using version 1.06 or higher then you don't have this problem, as this

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version supports mount points as well as device names in

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REMOUNT_PARTITIONS (or PARTITIONS, as it's called in the new config

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file format introduced in version 1.07).<br>

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<br>

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Why does syslogd sync all the time? Can I turn this off?

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</h3>

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<br>

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Yes, you can. In syslog.conf, you have to place a dash (-) before the

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log file name, e.g. the line <span style="font-family: monospace;">kern.*

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/var/log/kern.log</span> becomes <span style="font-family: monospace;">kern.*

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-/var/log/kern.log</span>. In addition, you can use <span

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style="font-family: monospace;">lm-syslog-setup</span> (included in

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laptop mode tools) to use different syslog.conf files based on whether

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you're running on battery or on AC power. This creates three different <span

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style="font-family: monospace;">syslog.conf</span> files in <span

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style="font-family: monospace;">/etc</span>: <span

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style="font-family: monospace;">syslog-on-battery.conf</span> for

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battery mode, <span style="font-family: monospace;">syslog-on-ac-with-lm.conf</span>

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for AC mode with Laptop Mode enabled, and <span

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style="font-family: monospace;">syslog-on-ac-without-lm.conf</span>

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for AC mode with Laptop Mode disabled. Laptop mode tools will then take

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care of syslog.conf, by making it a link to the appropriate config file

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based on the power and laptop mode state. After running <span

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style="font-family: monospace;">lm-syslog-setup</span>, you can

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perhaps modify the "battery" version of the syslog.conf so that it

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never syncs, while leaving the syncs intact when you're on AC.<br>

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<br>

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5. Spinup Debugging

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</h2>

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<br>

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My disk spins up all the time and I have no clue what causes this.

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Can I debug this?

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</h3>

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<br>

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Yes, you can. But first, check that you have modified your syslog.conf

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to not sync, as described in the next question. To debug disk activity,

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you can do:<br>

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<br>

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<div style="margin-left: 40px;"><span style="font-family: monospace;">echo

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1 > /proc/sys/vm/block_dump<br>

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<br>

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</span><span style="font-style: italic;">(</span><span

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style="font-weight: bold; font-style: italic;">Warning:</span><span

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style="font-style: italic;"> you <span

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style="text-decoration: underline;">must</span> disable syslogd before

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you do this, or you must make sure that kernel output is not logged. If

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you forget this, your system may get into a feedback loop, where

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syslogd causes disk activity, this causes kernel output, and this

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causes syslogd to do more disk activity, etcetera!)<br>

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<br>

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</span></div>

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This enables file/disk activity debugging in the kernel. You can read

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the output using <span style="font-family: monospace;">dmesg</span>.

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When you're done, disable block dump using<br>

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<br>

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<div style="margin-left: 40px;"><span style="font-family: monospace;">echo

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0 > /proc/sys/vm/block_dump<br>

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<br>

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</span></div>

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<span style="font-weight: bold;">NOTE: </span>Recently a tool called <span

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style="font-weight: bold; font-style: italic;">lm-profiler</span> was

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added to laptop-mode-tools, which does all this for you. It also

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detects network services that you might not want running, and it can

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install the services' init scripts into laptop mode's new

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"start/stop"  directory structure, so that they are automatically

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stopped when you are working on battery.<span

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style="font-family: monospace;"></span><span

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style="font-weight: bold; font-style: italic;"></span><br>

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<br>

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6. Common Problems

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</h2>

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<br>

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When I start laptop mode, it complains about an unknown mount option.

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</h3>

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<br>

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<ul>

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<li><span style="font-style: italic; font-weight: bold;">Least likely

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option:</span> You could have a 2.4 kernel version that doesn't support

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the <span style="font-family: monospace;">commit=</span> option for

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ReiserFS. To be honest, I have no clue whether that support was ever

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backported, so if anyone reading this has a 2.4 kernel running, try

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remounting your reiserfs partition with <span

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style="font-family: monospace;">-o remount,commit=5</span> and tell me

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if it complains about an unknown mount option.</li>

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<li><span style="font-weight: bold;"><span style="font-style: italic;">Most

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likely option: </span></span>Your root filesystem is mounted as ext2

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instead of ext3, because you did all of the following:<br>

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<ul>

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<li>You compiled ext3 as a kernel module.</li>

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<li>You don't use an initrd, or if you do, it does <span

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style="font-style: italic;">not</span> load the ext3 module.</li>

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<li>You did not explicitly specify the rootfstype as "ext3" in

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the kernel

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boot parameters. This means it is  autodetected as ext2 at boot

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time,

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because it lacks an ext3 module.</li>

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</ul>

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This problem is very nasty, because it is impossible to detect it --

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<span style="font-family: monospace;">/proc/mounts</span> will list the

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rootfstype as <span style="font-family: monospace;">rootfs</span>,

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which tells you nothing, and <span style="font-family: monospace;">mount</span>

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as well as <span style="font-family: monospace;">/etc/mtab</span> will

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tell you the fstype is in fact ext3 -- which is an incorrect <span

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style="font-style: italic;">guess</span>, taken from <span

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style="font-family: monospace;">/etc/fstab</span>. It puts your data

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at risk because you do not have journalling enabled, while you think

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you do. I've added a BIG FAT WARNING text when this happens in version

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1.06 of laptop mode tools.<br>

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</li>

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</ul>

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<br>

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My log / laptop_mode output says <span style="font-style: italic;">hdc:

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drive_cmd: status=0x51 { DriveReady SeekComplete Error }</span>

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</h3>

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<br>

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Then hdc is probably not a hard drive, nor a CD-ROM, and you should

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remove it from the HD parameter in /etc/laptop-mode/laptop-mode.conf.

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Fortunately, this doesn't actually break anything, so you can simply

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ignore the error messages as well. Recent versions of laptop-mode-tools

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correctly autodetect CD-ROM drives, so the error messages should be gone

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if you upgrade to the most recent version.<br>

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<br>

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I have an SATA disk and it doesn't work.

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</h3>

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<br>

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Spindown timeouts don't currently work on SATA drives, because the

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Linux kernel does not support that properly. There are patches available

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that add this support. Check out

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<a href="http://www.thinkwiki.org/wiki/Problems_with_SATA_and_Linux">http://www.thinkwiki.org/wiki/Problems_with_SATA_and_Linux</a>

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for all SATA-on-Linux problems. For laptop mode to work, you want the libata_passthru patch. It will be included

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in the Linux kernel starting from version 2.6.15. Note: You also need a

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recent version of hdparm in order to make this work!<br>

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<br>

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I have a SCSI disk and it doesn't work.

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</h3>

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<br>

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Starting from version 1.20 laptop-mode-tools supports SCSI drives.

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You have to make sure you have sdparm installed though!<br>

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<br>

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I run Slackware and Laptop Mode isn't initialized correctly on boot.

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</h3>

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<br>

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This is caused by the fact that Slackware doesn't follow the Filesystem Hierarchy Standard

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and it doesn't completely clear /var/run on boot. It will work when you include a call to

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<pre>/etc/rc.d/init.d/laptop-mode restart</pre> in your rc.local.<br>

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<br>

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I have an Apple notebook, and when I unplug the AC adapter Laptop

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Mode isn't enabled automatically.

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</h3>

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<br>

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If you are running <span style="font-style: italic;">pmud</span>, then

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you need to have the line "/usr/sbin/laptop_mode auto" in the file

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/etc/power/pwrctl-local. Version 1.05 and higher add this automatically, I

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just haven't had any reports that this actually works so be warned.

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Versions 1.05 and up also install <span style="font-style: italic;">pbbuttonsd</span>

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support, so that should work fine as well. Report back to me if it doesn't!<br>

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<br>

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My system gets horribly slow!

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</h3>

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<br>

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If you don't have that much RAM, you probably want to consider lowering

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the READAHEAD value in <span style="font-style: italic;">/etc/laptop-mode/laptop-mode.conf</span>.

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The default used to be 8MB, it was lowered to 3MB in version 1.05 for

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exactly this reason.<br>

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<br>

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I upgraded to version 1.06 or higher and hibernation no longer

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works / is horribly slow! What causes this?

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</h3>

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<br>

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This is caused by the introduction of write caching control. Apparently

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disbling the write cache makes some drives horribly slow. Set

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DO_WRITECACHE=0 (version 1.06) or CONTROL_HD_WRITECACHE=0 (version 1.07

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upward) to fix this. In a future version, this may be fixed by only

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disabling the write caches when the battery level is low. Note that

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writecache control is disabled by default in more recent versions.<br>

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<br>

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I've set LM_BATT_HD_IDLE_TIMEOUT_SECONDS to 20 seconds, but the drive

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spins down after 5 seconds, what's going on?

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</h3>

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<br>

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Some drives override the idle timeout setting (hdparm -S) when you also

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set an aggressive power management level (hdparm -B). Set

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CONTROL_HD_POWERMGMT=0 (supported from version 1.07) to stop laptop

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mode tools from fiddling with the HD powermanagement setting.<br>

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<br>

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I've set LM_BATT_HD_IDLE_TIMEOUT_SECONDS to 5 seconds, but the drive

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doesn't spin down at all.

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</h3>

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<br>

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Well, some drives have a specific minimum to the idle timeout values they

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support. Try increasing the value to 120 seconds and see if that works, then

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work your way back to the lowest value that still works.<br>

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<br>

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I experience system freezes every once in a while, is this normal?

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</h3>

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<br>

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This is a bug in hardware or the Linux kernel,

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triggered by something laptop mode tools does. Try setting

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CONTROL_HD_POWERMGMT=0. This fixes the freezes for some people.

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The default for CONTROL_HD_POWERMGMT was changed to 0 in version 1.11

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for exactly this reason. Otherwise, for now, downgrade to a kernel

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2.6.10 or earlier.<br>

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<br>

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Laptop mode causes filesystem corruption.

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</h3>

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<br>

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There has been a lengthy thread on the Linux Kernel mailing list about this,

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and the cause was determined to be the ipw2200 wireless network driver,

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version 1.0.8 (<a href="http://bughost.org/bugzilla/show_bug.cgi?id=821">http://bughost.org/bugzilla/show_bug.cgi?id=821</a>).

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This driver causes random memory corruption after some amount of network

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activity, and it will write a message "Firmware error detected. Restarting."

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to the kernel output. The memory corruption only happens the first time

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the message is shown (unless you have compiled the driver with some debugging

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options set), and can corrupt pretty much anything, including filesystem

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(meta)data that resides in memory. The chance that the overwritten data is,

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in fact, filesystem data is larger when you're running laptop mode, because

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laptop mode keeps filesystem data in memory for a longer period of time, thereby

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increasing the proportion of memory that contains filesystem data.<br>

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<br>

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I have an LVM partition and it doesn't get remounted.

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</h3>

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<br>

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This could be because laptop mode tools does not notice that the LVM

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partitions are on one of the hard drives that are listed in the HD

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configuration setting. You should list the devices by hand in the

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PARTITIONS configuration setting. (But: also check out the items on

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this configuration setting in the Configuration section of the FAQ!)<br>

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<br>

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I started using SELinux / upgraded to Fedora Core 4 and now Laptop

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Mode doesn't start when I unplug the power cord.

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</h3>

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<br>

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This is caused by SELinux controlling acpid / apmd. How to change this

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in FC4 (contributed by Vesko T. Tomov):<br>

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<ol>

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<li>Click on Desktop in the panel  --> System settings -->

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Security level</li>

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<li>Enter root password</li>

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<li>Click on SELinux tab</li>

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<li>Click on "SELinux Service Protection"</li>

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<li>Check box next to: Disable SELinux protection for apmd daemon,

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and click OK<br>

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</li>

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<li>Restart acpid<br>

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</li>

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</ol>

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<br>

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I run a 2.6.12 Linux kernel. Why does Laptop Mode no longer start

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when I close the lid?

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</h3>

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<br>

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Some guy decided to delete the whole /proc/acpi/buttons directory,

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without creating a replacement. It was reintroduced in 2.6.13, so I

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suggest that you upgrade.<br>

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<br>

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Why doesn't MUTT notice incoming mail anymore?

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</h3>

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<br>

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That's because Laptop Mode Tools remounts your filesystems with the

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"noatime" option, which prevents the updating of access times, while

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mutt is one of the few programs that actually <span

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style="font-style: italic;">use</span> the access times. Set

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DO_REMOUNT_NOATIME=0 (CONTROL_NOATIME in recent versions) in laptop-mode.conf

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to fix this. Note that the default for this option has been changed to 0 recently.<br>

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<br>

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Laptop mode stops working after I resume from hibernate.

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</h3>

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<br>

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Well, you'll have to restart the laptop-mode service after resuming from

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hibernation. The hibernate configuration file has support for starting/stopping

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services, you can use that.<br>

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<br>

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After the X screensaver has kicked in once, my X screen blanking

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settings are reset.

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</h3>

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<br>

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Yes, xscreensaver resets the X screen blanking settings. I'm trying to

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figure out how to fix this. Any ideas? Send me an e-mail!<br>

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<br>

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I monitor my drives using SMART, and my drive won't spin down.

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</h3>

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<br>

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Disable automatic offline testing with "smartctl -o 0". It prevents some

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drives from spinning down properly.<br>

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<br>

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One of my ext3/reiserfs partitions doesn't get remounted with the

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commit= option.

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</h3>

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<br>

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Check if it is listed as type "auto" in fstab. Laptop mode tools cannot currently

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detect the filesystem type if it is mounted as type "auto". If you desperately

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need this, drop me a line.<br>

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<br>

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7. Laptop Mode Tools Development / Contribution

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</h2>

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<br>

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What are the currently outstanding wishlist items that I shouldn't

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(or perhaps <span style="font-style: italic;">should</span>) bug the

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maintainer about?

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</h3>

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<br>

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<ol>

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<li>Not installing pbbuttonsd support on PC hardware, and not

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installing ACPI+APM support on Mac hardware.</li>

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<li>It seems that LVM partitions' default settings for noatime are

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not always correctly

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read from /etc/fstab. May be an fstab layout issue or something, I

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haven't been able to reproduce this. If anyone reading this has an LVM

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volume, please try and mark it as "noatime" in fstab, start laptop

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mode, stop laptop mode and check whether the noatime is still there --

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and mail me if it isn't. Thanks!

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</li>

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</ol>

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<br>

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Is there a Laptop Mode mailing list?

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</h3>

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<br>

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No. I'll create one if there is a lot of demand though.<br>

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<br>

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I have written this great library called libnosync, will you

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include it?

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</h3>

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<br>

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You wouldn't be the first. This library can be found in various

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incarnations on the web, and I think there are at least half a dozen

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people who have contacted me saying they either wrote this library, or

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they were thinking about doing it. No, I will not include it in laptop

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mode tools, as laptop mode tools is an architecture independent

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package. I might add <span style="font-style: italic;">support</span>

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for enabling/disabling it together with laptop mode though. I have some

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plans to build a clean, configurable version of this library (which

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would allow control at the user and process level, i.e. "disallow sync

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only for emacs and vi, but not when they're run by root" and which

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would be able to report all syncs to a log file). This would become a

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separate package though!<br>

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<br>

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I have a great idea for saving more power. Will you include it in

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Laptop Mode Tools?

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</h3>

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<br>

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If you can write it as a plugin, to be placed in <span

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style="font-style: italic;">/etc/laptop-mode/batt-start</span> or the

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like, then you can put it on the web yourself, and I'll gladly link to

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your site. I'll even put it on my site, if you don't have a website to

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put it on. If it's more complicated than that, or if it will benefit a

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lot of people, then I'll consider including it.<br>

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<br>

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8. Other Questions

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</h2>

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<br>

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What if my question isn't in here?

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</h3>

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<br>

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Read the manual pages (the one you want to read is the one called <span

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style="font-style: italic;">laptop-mode.conf</span>). If that doesn't

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give you the answer, contact <a href="mailto:bart@samwel.tk">Bart

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Samwel (bart@samwel.tk)</a>.<br>

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<br>

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</body>

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