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- === pm-utils ===
-
- What is pm-utils?
-
- * Pm-utils provides simple shell command line tools to suspend and
- hibernate computer that can be used to run vendor, distribution, or
- user supplied scripts on suspend and resume.
-
- Why do we need it?
-
- * All the main distributions are re-implementing the same
- functionality to support common power management
- operations. pm-utils provides a standardized distribution agnostic
- layout and interface for common power management tasks, which frees
- software and hardware vendors from having to maintain
- distribution-specific suspend/resume functionality.
-
- * Suspend/resume functionality can be easily modified by installing
- files into the /etc/pm/sleep.d directory. These files, known as
- hooks, can perform specific tasks on suspend/resume, such as:
-
- - enabling and disabling standby LED's on laptop hardware
- - enabling suspend GUI's like suspend2
- - re-enabling video
- - starting and stopping services that can't cope with suspending
- - re-syncing the time with ntp
- - removing and modprobing modules when needed
- - setting grub to be the default target for a hibernate-resume
- - other wacky things that need doing on specific systems
-
- How do hooks work?
-
- * You put an executable file in /etc/pm/sleep.d. When suspend or
- hibernate is called, several things happen:
-
- 1) The files in /etc/pm/config.d/* are evaluated in C sort order.
- These files can be provided by individual packages outside of
- pm-utils, and contain globally available configuration settings
- for pm-utils and the hooks.
- 2) Each of the hooks in /etc/pm/sleep.d/* are executed in C sort
- order, with a command line argument of either "suspend" or "hibernate".
- 3) The system suspends or hibernates.
- 4) Some event happens to wake the machine up
- 5) Each of /etc/pm/sleep.d/* are executed in reverse C sort order,
- with a command line argument of "resume" or "thaw".
-
- * For more detailed information on how hooks work and how to write one,
- read HOWTO.hooks .
-
- * For information on how to debug pm-utils, read README.debugging.
-
- That's it!
-
-