[Bug 92998] gpu hang after resume on ivybridge and dmesg errors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92998

--- Comment #10 from Tasev <tasev.stefanoska at skynet.be> ---
Hi

Just tested 4.4-rc6 , no changes.

I purged the oibaf ppa, revert to mesa 10.1 stable with no luck,
just to check that the problem is not in mesa.

But reverting  drm/i915: Wa32bitGeneralStateOffset &
Wa32bitInstructionBaseOffset
still fix the hang.

Once i noticed after gpu hang in dmesg (i don't know if it is important): 

[drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo
underrun on pipe C

I also find that switching VT with CTRL ALT F1 is not working since
4.4-rc1, i just have a black screen with nothing displayed on it, but typing
something (in the dark sudo reboot) is working. But i suppose that this is a
separate issue.

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