[Bug 79996] [SNB bisected] GPU hang Linux 3.15 (Shuttle SH67, Xeon E3 1235)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79996

--- Comment #2 from jclw at ymail.com ---
Hmm, your patch does not fix the problem; putting 

    I915_WRITE(GEN6_GT_MODE, _MASKED_BIT_DISABLE(0xffff));

behind

    if (IS_SNB_GT1(dev)) I915_WRITE(GEN6_GT_MODE,
_MASKED_BIT_ENABLE(GEN6_TD_FOUR_ROW_DISPATCH_DISABLE));

however does.  So does removing both of the above.

IS_SNB_GT1 is true for device id 0x010a. Isn't this wrong? Don't the Sandy
Bridge Xeon E3 GPUs have 12 Execution Units and would therefore not be GT1?

I'm confused.

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