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Some notes on preparing a system for use with powernowd.
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The requirements for powernowd are really minimal. If you use a prebuilt 2.6
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kernel package, all the required kernel modules are included. You just need
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to ensure they are loaded (cpufreq_userspace, and on my system also
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speedstep_centrino). One way to do this is to add them to /etc/modules, which
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will cause them to load at boot time (see "man 5 modules").
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If you want to build your own kernel, make sure you include the userspace
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CPU frequency scaling governor in your config. Any released 2.6 kernel
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version should work, with the at least the following config options enabled:
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CONFIG_CPU_FREQ_GOV_USERSPACE
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You also need one of the processor drivers enabled, for my Pentium M notebook
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the right config option is:
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CONFIG_X86_SPEEDSTEP_CENTRINO
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I have all of these "=y" in my config file so that they are built directly
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into the kernel. If you decide to build them as modules, it's up to you to
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make sure they get loaded just as would be necessary with a Debian pre-built
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You also need to have the sysfs file system mounted, so that the daemon can
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find the interface to the frequency scaling support in the kernel. If that
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isn't already done, mkdir /sys and add an entry to /etc/fstab that looks
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sysfs /sys sysfs defaults 0 0
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The entry that must be visible before powernowd can function is:
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/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
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If that file isn't present, then the /etc/init.d/powernowd script will point
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you to this file instead of trying to launch the daemon...
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Hopefully, that's enough information to get you going!
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Bdale Garbee, <bdale@gag.com>, Mon, 29 Nov 2004 02:12:16 -0700
added
removed
debian/README.Debian
