I believe I encountered the same issue while working on bug #1412602
which is unrelated to this bug.
In the process of testing the nouveau driver with an nVidia C61 [GeForce
7025 / nForce 630a] chipset on Ubuntu GNOME Trusty with the Utopic HWE
and 3.16.0-31-generic from trusty-proposed I experienced what I'd call a
soft-lockup (I could still move the mouse pointer but all else was
unresponsive) and after a minute or two the screen went basically blank
with this message sprawled across the screen:
[ 1206.026900] nouveau E[ DRM] GPU lockup - switching to software
fbcon
[ 1305.160013] nouveau E[Xorg[955]] failed to idle channel 0xeeee0000
[Xorg[955]]
[ 1320.160018] nouveau E[Xorg[955]] failed to idle channel 0xeeee0000
[Xorg[955]]
[ 1328.076012] BUG: soft lockup - GPU#0 stuck for 21sf [gnome-
shell:1740]
After reboot I found a crash report in /var/log/crash but it was
unreportable, the details say:
This problem report is damaged and cannot be processed.
EOF Error('Compressed file ended before the end-of-stream marker was
reached',)
I'm attaching a picture of the screen during freeze.
** Attachment added: "IMG_4845.JPG"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1291574/+attachment/4320755/+files/IMG_4845.JPG
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https://bugs.launchpad.net/bugs/1291574
Title:
nouveau DRM GPU lockup, PFIFO unhandled status 0x00800000
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