[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

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

--- Comment #15 from Kertesz Laszlo <laszlo.kertesz@gmail.com> ---
Created attachment 113871
  --> https://bugzilla.kernel.org/attachment.cgi?id=113871&action=edit
dmesg, kernel next-20131108 until it froze

Tried the next-20131108 kernel.
Still crashes, but now the GPU softresets, sometimes even 5 or so times in a
row. If it resets multiple times, usually freezes the X server, only the mouse
is moving. Sometimes it resets 1 or 2 times first then the X server is usable
(it resets afterwards out of the blue too sometimes, but the X session isnt
affected).
But if i try to launch TF2 again, it locks the X server and sometimes freezes
the whole computer (logs dont show anything). Most times i was able to reboot
with the sysrq keys.

PS. Weird thing, i once was able to play TF2 with the 3.12 final kernel too.
Then it was perfectly playable, launched it a few times in a row and had no
issues whatsoever. I did nothing out of the ordinary, the session was running
for a day or 2 after which i launched it, previously i compiled stuff, tested
stuff in virtual machines, watched movies, browsed etc.
However after reboot i couldnt reproduce this. No software (mesa etc) was
changed, but after reboot, it crashed as before.

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