[Bug 38488] New: AMD Radeon HD 6950 (Cayman): Clocks not restored after resume from hibernation

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
        ReportedBy: h.judt at 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?

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