[Bug 98832] Distorted colours after suspend / resume cycle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98832

--- Comment #5 from Jan-Marek Glogowski <glogow at fbihome.de> ---
Created attachment 128190
  --> https://bugs.freedesktop.org/attachment.cgi?id=128190&action=edit
Ubuntu Linux kernel diff of 3.13

So I thought this bug is the actual problem I'm seeing, or has at least the
same origin, but it's not. Using Linux 3.13, I also see this bug when returning
after a longer idle time. No suspend is involved.

And still a "xset dpms for off" call fixes the palette problem.

Now I had a look at the HWE kernel of our previous Precise (12.04) based
release, where we didn't see this problem with the same HW. The attached diff
includes all radeon changes between our working version and the current kernel
(~2k lines).

The most prominent change is probably the default switch to DPM for
CHIP_CAICOS, but that's really a long shot (profile => dpm in
/sys/class/drm/card0/device/power_method).

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