[TuxOnIce-users] Graphics power profile works after suspend and resume, but not after hibernate and resume

[Harald Judt]

Hi,

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.


Question:

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...?

Regards,
Harald

-- 
`Experience is the best teacher.'