[Bug 55984] [ilk regression] gpu hangs on ironlake with 3.6 + -next + -fixes code

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55984

--- Comment #76 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ok, after banging my head against this for several days, I have decreed that
the death within the render ring (inside the sequence of FLUSH PIPE_CONTROLx8
FLUSH) is due to enabling of rc6 on ILK. That doesn't explain all the crashes,
but it does explain the "immediate" crashes on danvet-ilk using Daniel's
killscript.

The remaining crashes, where the GPU vanishes in mid-batch, are what we need to
try and reproduce - and I hope the common factor between this bug and #57122,
#56916, #57136.

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