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* Suspend/resume functionality can be easily modified by installing
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files into the /etc/pm/sleep.d directory. These files, known as
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"hooks" can perform specific tasks on suspend/resume, such as:
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hooks, can perform specific tasks on suspend/resume, such as:
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- enabling and disabling standby LED's on laptop hardware
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- enabling suspend GUI's like suspend2
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- setting grub to be the default target for a hibernate-resume
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- other wacky things that need doing on specific systems
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* You put an executable file in /etc/pm/sleep.d. When suspend or
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hibernate is called, several things happen:
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5) Each of /etc/pm/sleep.d/* are executed in reverse C sort order,
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with a command line argument of "resume" or "thaw".
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End-user customization and debugging:
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* If a particular hook is causing problems on your system, you can disable it
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using the HOOK_BLACKLIST environment variable by creating a file in
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/etc/pm/config.d and adding the line:
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HOOK_BLACKLIST="hookname 99another-hook"
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* If a parameter (or lack thereof) passed to pm-suspend and friends is causing
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problems, or you need to debug the suspend/resume process to work out what
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quirks are causing problems, you can use the ADD_PARAMETERS and
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DROP_PARAMETERS environment variables. To do this, create a file in
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/etc/pm/config.d, and add the following lines to it:
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ADD_PARAMETERS="--parameter-to-add --another-parameter"
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DROP_PARAMETERS="--parameter-to-drop --another-parameter-to-drop"
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If you want to drop all parameters (for testing purposes, or to work around
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bugs in HAL), you can use DROP_PARAMETERS="all"
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* If you suspect that a kernel module is preventing you from being
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able to suspend and resume, you can use the SUSPEND_MODULES
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environment variable to have that module removed when the system
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suspends and reloaded when the system wakes up.
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* To find out what parameters can be passed to pm-suspend and friends, run them
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with '--help' as the first parameter as root. This will print out the
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options that it supports and which hooks or modules handle those options.
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* For more detailed information on how hooks work and how to write one,
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* For information on how to debug pm-utils, read README.debugging.
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