https://bugs.freedesktop.org/show_bug.cgi?id=38488
Summary: AMD Radeon HD 6950 (Cayman): Clocks not restored after resume from hibernation Product: DRI Version: XOrg CVS Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: h.judt@gmx.at
Power profile does not work after resuming.
Steps to reproduce:
1) Boot system, set power profile to low.
$ cat /sys/kernel/debug/dri/64/radeon_pm_info: default engine clock: 800000 kHz current engine clock: 249990 kHz default memory clock: 1250000 kHz current memory clock: 150000 kHz voltage: 900 mV
2) Hibernate system and resume.
Expected results:
* Power profile still set to low, clocks stay at low level.
* Power profile can be changed, and changes have desired effects.
Actual results:
* Power profile still shows "low", but according to debugfs clocks are at default levels:
default engine clock: 800000 kHz current engine clock: 799940 kHz default memory clock: 1250000 kHz current memory clock: 1250000 kHz voltage: 65281 mV
Voltage does seem strange too, when regarding the 900 mV above.
* Power profile can be changed, but clocks will not change.
* Fan is spinning louder due to the higher (default instead of low level) clock speeds.
I have to admit that I modified and applied tuxonice patch to linux-3.0-rc3, but on a laptop at work I use exactly the same and everything works correctly there (ATI Mobility Radeon HD 3400), so I don't believe I messed up. Cayman support is still quite new...
Is there another way to change the clock speeds?