[Bug 69723] GPU lockups with kernel 3.11.0 / 3.12-rc1 when dpm=1 on r600g (Cayman)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69723

--- Comment #65 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
(In reply to comment #63)
> Created attachment 90542 [details] [review]
> possible fix
> 
> Thanks for tracking this down.  The attached patch should fix the issue. 
> With this fixed, it may be worth checking to see if you can reliably use the
> tweaked clocks on certain oem boards (basically disable the ni code added to
> fix bug 69723).

I reverted patches from bug 68235 as suggested, applied the proposed patch to
disable mclk spread spectrum and I'm now running this new kernel. First
observation: without patches from bug 68235 prior to disabling mclk ss, I was
unable to load a session without it hanging in less thant a minute. It's now
rock solid running GPU clock at 830MHz and memory clock at 1300MHz. I'll run a
couple of other tests, but I think we got it!

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