[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 #57 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
(In reply to comment #54)
> However if I set pi->dynamic_ss to false the lockups disappear, it also
> works with dynamic_ss set to true and pi->mclk_ss set to false.
>
So this seems to point to a spread spectrum mischief. I don't know if
dynamic_ss automatically applies to mclk but it seems to, since disabling
spread spectrum only for mclk solves your problem. We could suspect that at a
given frequency, we have a problem restoring the original message / clock (the
higher we get, the harder it is) until at some point it becomes unreliable.

I should be able to test it later tonight to confirm if this fixes the bug on
my side too.

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