[Bug 63101] Hard lockup whel launching games like TF2 on kernels 3.11.5 and 3.12 rc4 and above if radeon.dpm=1 is used

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=63101

--- Comment #14 from Kertesz Laszlo <laszlo.kertesz@gmail.com> ---
I did some more testing. Turns out that i can get into the game if i set the
texture quality to "low". But it still crashes afterwards at some point -
usually after ~20 or so minutes.

Sometimes io have tons of messages like this:

Oct 22 13:06:00 laca-desktop kernel: [  561.631586] [TTM] Buffer eviction
failed
Oct 22 13:06:00 laca-desktop kernel: [  561.631594] radeon 0000:00:01.0:
ffff88005c4e8400 pin failed
Oct 22 13:06:00 laca-desktop kernel: [  561.631596] [drm:radeon_crtc_page_flip]
*ERROR* failed to pin new rbo buffer before flip

or

Oct 22 13:06:00 laca-desktop kernel: [  561.743974] radeon 0000:00:01.0:
ffff88005c4e8400 pin failed
Oct 22 13:06:00 laca-desktop kernel: [  561.743977] [drm:radeon_crtc_page_flip]
*ERROR* failed to pin new rbo buffer before flip


With the latest git kernel after the crash gpu lockup message the computer is
still somewhat usable, the GPU is throttled to max and opengl apps fail with
"Bus Error" (both tf2 and glxgears report this error). Sometimes after a while
the computer freezes if left in this state.

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