[Bug 67121] Broken suspend/resume with radeon/KMS on RS482M

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=67121

--- Comment #7 from Adrian Knoth <adi at drcomp.erfurt.thur.de> ---
Random observation: high CPU usage "uncripples" the video output.

That is: I suspend to RAM, I resume and unplug the AC, causing the screen to be
heavily distorted.

When I blindly start burnK7 (from Debian's cpuburn package), CPU usage on one
of the cores jumps to 100% and I have a wonderful clear and perfect screen. As
soon as I terminate burnK7, the corruption is back. (with AC unplugged all the
time; of course, plugging the AC back in always fixes the corruption).

So it's a power management issue. For some reasons, the radeon driver (or the
hardware) is sensitive to CPU power saving states (idle states?) and the
presence of an external power supply. And all this only happens with KMS, not
with UMS.

So is it an ACPI/PM bug? Or DRI?

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