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This consists of core features extracted from the powersave-hooks branch, and
does the following:
* Refactor some settings in pm-functions to make it easier to support seperate
settings for pm-action and pm-powersave. Other than sharing a mechanism for
running hooks and being able to use certian utility functions, they do not
have much in common w.r.t settings and lifecycle rules for those settings.
* Move take_suspend_lock from pm-functions to pm-action. pm-powersave uses a
simpler scheme, and there is not enough code sharing to justify having it in
pm-functions.
* Add a bit of code to pm-functions to figure out what chassis type we are
running on.
* Add a 00powersave hook that turns powersaving off across a suspend/resume.
Things like laptop-mode in particular have been known to cause issues in
some situations.
* Make pm-powersave log to a real logfile and try to guess at the appropriate
powersave mode if called with no arguments.
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