[Bug 71432] [ILK] GPU hung with h.264 video decoding

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71432

--- Comment #19 from Mihail Kasadjikov <hamer.mk at gmail.com> ---
I found and removed the «semaphores=0» from «/etc/modprobe.d/options.conf». It
was added as a workaround according to bug #54226.

Right now I have no any parameters for i915 kernel module
$ cat /proc/cmdline 
root=/dev/mapper/h13ssd-root ro ipv6.disable=1 elevator=deadline
no_console_suspend=1 pcie_aspm=powersave video=inteldrmfb:1280x800R-8 quiet
intel_iommu=igfx_off resume=/dev/mapper/h13ssd-swap zswap.enabled=1

But after some videos on youtube using flashplayer I've got the «Hangcheck
timer elapsed» without overall system hung:
$ dmesg | grep Hang
[ 4121.662268] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed...
bsd ring idle

It is interesting but after this message in dmesg and little pause in video
playback, the other videos on YT are playing with HW decoder normally and
without errors for long time...

And this, after message in dmesg:
# cat /sys/kernel/debug/dri/0/i915_error_state
no error state collected

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