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

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

--- Comment #57 from Alexandre Demers alexandre.f.demers@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.