[Bug 83677] [HSW gt1] GPU HANG: ecode 0:0x87d3bffa on ctx load

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83677

--- Comment #132 from dhead666 <myfoolishgames at gmail.com> ---
The huge patch that ported to 3.17.4 by Hugh Greenberg is working very well for
me.
After a day of work with the system I didn't experience any freezes or hangs
with Chromium or at all.
I only kept the kernel parameter i915.modeset=1.

I did experienced a rare slowdown of Chromium with a segfault in journald, I
didn't saw such segfault before.

kernel: WebCore: Worker[15893]: segfault at fbadbeef ip 00007f75abde2e25 sp
00007f758d175190 error 6 in chromium[7f75a993d000+5b6f000

What changed from upstream kernel is that with upstream:
* when no kernel parameter used (except i915.modeset=1) Chromium would hangs
and would force me to kill it.
* when using the parameters: i915.modeset=1 i915.semaphores=0
i915.use_mmio_flip=1 i915.enable_ppgtt=1 drm.vblankoffdelay=1, instead of
hanging, Chromium would slow down the system to almost a halt, Kodi would also
triger such slowdowns (in much higher rate than with the patch), it seems like
i915.semaphores=0 is the one making the difference between hang to slowdown.

I didn't gave much attention to testing vaapi, but it does seem works fine.

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