[Nouveau] [Bug 89912] Sometimes Nouveau hangs kernel with PGRAPH engine fault

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89912

--- Comment #2 from Argyris Megalios <argymeg at gmail.com> ---
I'm having the same issue here. Same card (GTX 650 Ti) on Arch, presently on
kernel version 4.0.5. The last journal entries after each freeze are
consistently:

kernel: nouveau E[   PFIFO][0000:01:00.0] write fault at 0x00002a0000 [PTE]
from GR/GPC0/PROP_0 on channel 0x007f96c000 [Xorg[383]]
kernel: nouveau E[   PFIFO][0000:01:00.0] PGR engine fault on channel 2,
recovering...

Except the channel number which is different every time.
Everything except the mouse cursor freezes, while sound also continues for a
few seconds before stopping. However, I can login from another machine via SSH
and restart SDDM just fine, although it takes about half a minute (from the
usual 2-3 seconds).
I'm using KDE and although it happens randomly, there seems to be a correlation
with having Kaffeine playing TV in the background. No consistency, though.

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