Blank screen after computer locks for long time

[Paul E]

After my computer is locked for a long time, I am unable to get back to the unlock screen, nor can I get to the virtual terminals. I suspect this is an issue with nouveau, as kern.log has the lines:

May 4 20:06:15 paul-OptiPlex-9020-citp kernel: [32188.115554] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 4 20:06:15 paul-OptiPlex-9020-citp kernel: [32188.115559] nouveau 0000:01:00.0: fifo: sw engine fault on channel 2, recovering...
May 4 20:06:17 paul-OptiPlex-9020-citp kernel: [32190.115160] nouveau 0000:01:00.0: fifo: runlist 0 update timeout
May 4 20:06:19 paul-OptiPlex-9020-citp kernel: [32192.410337] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 4 20:06:23 paul-OptiPlex-9020-citp kernel: [32196.705111] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]

with the last line repeated many times.

Bugs I found with similar error messages:
https://bugs.freedesktop.org/show_bug.cgi?id=90453
https://bugs.freedesktop.org/show_bug.cgi?id=72180

[jaime.undurraga (jaime-undurraga)]

I have the same issue.
May 25 10:12:26 jundurraga-sydney kernel: [166153.699295] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:12:30 jundurraga-sydney kernel: [166157.993822] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:12:34 jundurraga-sydney kernel: [166162.288345] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:12:38 jundurraga-sydney kernel: [166166.582867] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:12:43 jundurraga-sydney kernel: [166170.877336] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:12:47 jundurraga-sydney kernel: [166175.171855] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:12:51 jundurraga-sydney kernel: [166179.466351] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:12:56 jundurraga-sydney kernel: [166183.760890] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:13:00 jundurraga-sydney kernel: [166188.055410] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:13:04 jundurraga-sydney kernel: [166192.349909] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:13:08 jundurraga-sydney kernel: [166196.644426] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
May 25 10:13:13 jundurraga-sydney kernel: [166200.938946] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]

[penalvch (penalvch)]

Paul E, thank you for reporting this and helping make Ubuntu better.

Could you please run the following command once from a terminal by ensuring you have the package xdiagnose installed, and that you click the Yes button for attaching additional debugging information:
apport-collect -p xorg 1578715

When reporting xorg related bugs in the future, please do so via the above method. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]