[Bug 38488] 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

--- Comment #2 from Harald Judt <h.judt at gmx.at> 2011-06-22 15:19:54 PDT ---
Thanks for your response. Yes, I'm sure. I've already tried what you suggested,
it doesn't matter. Additionally, the display will not flicker when changing the
power profile after resume, in contrast to before hibernation.

low:
default engine clock: 800000 kHz
current engine clock: 249990 kHz
default memory clock: 1250000 kHz
current memory clock: 150000 kHz
voltage: 900 mV

medium:
default engine clock: 800000 kHz
current engine clock: 499990 kHz
default memory clock: 1250000 kHz
current memory clock: 1250000 kHz
voltage: 1000 mV

default:
default engine clock: 800000 kHz
current engine clock: 799940 kHz
default memory clock: 1250000 kHz
current memory clock: 1250000 kHz
voltage: 1000 mV

high:
Not possible, machine freezes completely. Not even magic sysreq keys work
anymore, hard reset required.

Is there any other way to change the clock speeds, without using power_profile?

As explained before, something seems to get messed up by standby/resume (see
strange voltage readings in my initial report). This *could* be caused by me
applying self-modified tuxonice patch. I will have to test hibernation in
vanilla kernel to exclude this possibility.

On the other hand, power_profile 'high' doesn't work at all, and I don't think
this has anything to do with suspend/hibernation or the tuxonice patch. Shall I
open another bug report for this?

I understand that cayman support is still in development.

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