[Bug 89915] GPU HANG, reason: Ring hung, action: reset - Often after suspension

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89915

--- Comment #3 from Eugenio <jfrusciante at tiscali.it> ---
Thanks for the suggestion. The error is not easily reproducible but shows up
quite randomly after intense use of Chrome, however I've run the laptop for 2
days with "i915.enable_execlists=0" and it did not show up. Reboot once without
it, and after one suspension I got the error again. So the option likely solved
it. 

After 2 days with "i915.enable_execlists=0" I found only this instead:

[ 8171.802098] PM: Entering mem sleep
[ 8171.802110] Suspending console(s) (use no_console_suspend to debug)
[ 8171.803545] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[ 8171.807718] sd 0:0:0:0: [sda] Stopping disk
[ 8172.835579] [drm:stop_ring [i915]] *ERROR* render ring : timed out trying to
stop ring
[ 8173.267949] PM: suspend of devices complete after 1464.521 msecs

which seems to be related with the beginning of suspension and did not cause
any freeze nor crash.
Also, I have now thousands of "Unclaimed register detected" messages. Not fatal
nor problematic, just annoying for filling the log. Not sure if related or not.

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