[Bug 63101] Hard lockup whel launching games like TF2 on kernels 3.11.5 and 3.12 rc4 and above

[bugzilla-daemon at bugzilla.kernel.org]

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

--- Comment #2 from Kertesz Laszlo <laszlo.kertesz at gmail.com> ---
Going back to commit 95167aad6761ec8a0fc76506ed00439483208ee1

- GPU lockup only, somewhat recoverable error, gpu locked in highest power
state.
lots of errors like 
[  523.602078] radeon 0000:00:01.0: ffff8800034ebc00 pin failed
And
[  546.612391] WARNING: CPU: 0 PID: 2891 at drivers/gpu/drm/drm_mm.c:257
ttm_bo_man_put_node+0x23/0x3d [ttm]()

No other errors, i can even launch other games (tried DoD). The CPU is severely
throttled (this is with 4 threads compile, the CPU is rated at 3.2 GHz):

# cpufreq-aperf -o
CPU    Average freq(KHz)    Time in C0    Time in Cx    C0 percentage
000    1536000            00 sec 996 ms    00 sec 003 ms    99
001    1536000            00 sec 984 ms    00 sec 015 ms    98
002    1536000            00 sec 970 ms    00 sec 029 ms    97
003    1536000            00 sec 985 ms    00 sec 014 ms    98

probably because of the GPU being in the highest state.
Attached dmesg. I continue bisecting.

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