[TuxOnIce-users] Graphics power profile works after suspend and resume, but not after hibernate and resume
h.judt at gmx.at
Mon Aug 1 10:09:36 EDT 2011
I've got the following very strange problem regarding hibernation and
graphics card power profile:
* Boot system, set power profile to 'low':
'echo low > /sys/class/drm/card0/device/power_profile'
* Hibernate & resume:
power profile is still at low when checked, but
1) Clocks are at defaults.
2) Changing power profile has no effects on the clocks.
* Suspend & resume:
1) Power profile works as expected.
2) If done after hibernate & resume, it fixes the issue.
Is this a problem with the driver or could there be something wrong with
the hibernation code? There should not be any differences between
suspend-to-ram and suspend-to-disk for the driver??
It only happens with this specific graphics card where drm/kms support
was implemented not long ago (ATI Radeon HD6950).
BTW: This occurs when using vanilla kernel too, so this might be the
wrong place to ask for clarification, but anyway...?
`Experience is the best teacher.'
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