[Bug 104401] GPU HANG: ecode 7:0:0xab0f77f9, in Xorg [1348], reason: Hang on rcs0, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104401

--- Comment #11 from Luca Bonissi <freedesktop at scarsita.it> ---
(In reply to Lakshmi from comment #10)
>
> From the attached logs, I don't see GPU hang messages. Attached crash dump
> is from kernel 4.13.
> 
> So, the system hangs/frozen with latest kernel?

>From kernel 4.7.3 the system hangs/frozen nearly one a day (it usually hangs
during the night, when DPMS switched off the monitor), so it hangs also with
the latest kernel 5.0.4.

Unfortunately, only 1 time (with kernel 4.13) the system did not freeze and I
could get the GPU crash dump.

Also another system, with Intel N2840 CPU and the same integrated GPU, suffers
the same problem (I lost some audio recording data due to the bug....). If I
disabled DPMS, no problems occurred.

Anyway, the problem is identified somewhere in the "HPD polling" routines,
introduced in kernel 4.7.3: if I remove these routines, the system works fine
without any hangs (neither GPU nor totally).
It seemed something with mutex (try to lock when already locked...), but I am
not a mutex/GPU expert....

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