Nouveau trouble

[Anders Wegge Keller]

 With a Dell Precision M4600, running Fedora 21, I've started experiencing
troubles with my X sessions within the last six months. The symptoms is that
X frezzes, and sometimes, but not always, I can switch to a VT and make a
controlled shutdown. At other times, the machine is totally unresponsive,
and the only resort is to force a powerdown. I cannot state a more precise
date for the first occurrence, as I wrote it off as thermal problems.
However, after a vacuum session, the problem persisted, so I dug into the
system logs. In /var/log/messages, I find the following pattern on each
occurrence:

Apr 28 00:18:35 localhost kernel: [11057.344140] nouveau
E[gnome-shell[2031]] multiple instances of buffer 156 on validation list
Apr 28 00:18:35 localhost kernel: [11057.344157] nouveau
E[gnome-shell[2031]] validate_init
Apr 28 00:18:35 localhost kernel: [11057.344162] nouveau
E[gnome-shell[2031]] validate: -22
Apr 28 00:18:35 localhost kernel: nouveau E[gnome-shell[2031]] multiple
instances of buffer 156 on validation list
Apr 28 00:18:35 localhost kernel: nouveau E[gnome-shell[2031]] validate_init
Apr 28 00:18:35 localhost kernel: nouveau E[gnome-shell[2031]] validate: -22
Apr 28 00:18:35 localhost gnome-session: nouveau: kernel rejected pushbuf:
Ugyldigt argument
Apr 28 00:18:35 localhost gnome-session: nouveau: ch0: krec 0 pushes 1 bufs
16 relocs 0
Apr 28 00:18:35 localhost gnome-session: nouveau: ch0: buf 00000000 00000002
000 00004 00000004 00000000
Apr 28 00:18:35 localhost gnome-session: nouveau: ch0: buf 00000001 0000009e
000 00002 00000002 00000000
Apr 28 00:18:35 localhost gnome-session: nouveau: ch0: buf 00000002 00000079
000 00004 00000004 00000000
Apr 28 00:18:35 localhost gnome-session: nouveau: ch0: buf 00000003 00000007
00000002 00000002 00000000
...

The graphics card identifies as follows:

01:00.0 VGA compatible controller: NVIDIA Corporation GF108GLM [Quadro
1000M] (rev a1)

The frequency of the lock-ups are independant on wheter Optimus Prime is
enabled or not.

Has anyone seen something similar to this before, and if so, what cures have
you found?



-- 
//Wegge