[Nouveau] [Bug 90453] [NVE4] Desktop freezes & PDISP, PFIFO, PGRAPH and PGR errors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90453

--- Comment #24 from Timothy Pearson <kb9vqf at pearsoncomputing.net> ---
(In reply to Mario Barrera from comment #23)
> Same issue over here, it is a NVE4 too. I will be using the proprietary
> driver from now on until I know better how to help diagnose this.
> 
> [ 7104.402763] nouveau E[   PFIFO][0000:01:00.0] SCHED_ERROR [ CTXSW_TIMEOUT
> ]
> [ 7104.402770] nouveau E[   PFIFO][0000:01:00.0] PGRAPH engine fault on
> channel 7, recovering...
> 
> ...and video freezes forever.

Unfortunately I'm seeing the same problem.  I have been able to reproduce it
very consistently under two circumstances:
1.) Starting a new X11 session when one is already running (using TDM, a fork
of the older KDE 3.5 KDM)
2.) Trying to select an OpenGL screensaver.  If you go through the list of
OpenGL screensavers, occasionally selecting one for full-screen preview, the
GPU will hang after going through no more than around a dozen savers.

Reclocking status does not matter; fault occurs on both low and high clocks.

Kernel 4.1:
[  914.928160] nouveau E[   PFIFO][0000:01:00.0] read fault at 0x0000490000
[PTE] from GR/SCC on channel 0x00fec92000 [matrixview[27252]]
[  914.928169] nouveau E[   PFIFO][0000:01:00.0] PGRAPH engine fault on channel
7, recovering..

Going back to the proprietary drivers is not an option here due to a serious
bug in those drivers, so if there's anything I can do to help diagnose this
issue please let me know.

Thanks!

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