[Nouveau] [Bug 94694] [NVC1] Attempt to use kde/plasma renders the system immediately unresponsive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94694

--- Comment #2 from Alexander Dubov <oakad at yahoo.com> ---
Some additional messages do appear:

Mar 25 23:40:44 mercador kernel: nouveau 0000:01:00.0: fifo: SCHED_ERROR 0d []
Mar 25 23:40:46 mercador kernel: nouveau 0000:01:00.0: fifo: runlist update
time
out
Mar 25 23:40:46 mercador kernel: nouveau 0000:01:00.0: fifo: INTR 00000001:
0000
000b

During a different attempt:

Mar 25 18:19:03 mercador kernel: [ 3381.724766] nouveau 0000:01:00.0: fifo:
PBDM
A0: 00040000 [] ch 17 [003f4cc000 plasmashell[24734]] subc 0 mthd 2490 data
0000
00d0
Mar 25 18:19:03 mercador kernel: [ 3381.724779] nouveau 0000:01:00.0: fifo:
PBDM
A0: 00200000 [ILLEGAL_MTHD] ch 17 [003f4cc000 plasmashell[24734]] subc 0 mthd
00
0c data 80ff0e04
Mar 25 18:19:03 mercador kernel: [ 3381.724789] nouveau 0000:01:00.0: fifo:
PBDM
A0: 02000000 [] ch 17 [003f4cc000 plasmashell[24734]] subc 0 mthd 0020 data
0000
8006
Mar 25 18:19:03 mercador kernel: [ 3381.724801] nouveau 0000:01:00.0: fifo:
PBDM
A0: 00200000 [ILLEGAL_MTHD] ch 17 [003f4cc000 plasmashell[24734]] subc 0 mthd
00
30 data 800103e4
Mar 25 18:19:03 mercador kernel: [ 3381.724812] nouveau 0000:01:00.0: fifo:
PBDM
A0: 00200000 [ILLEGAL_MTHD] ch 17 [003f4cc000 plasmashell[24734]] subc 0 mthd
00
34 data 20010680
Mar 25 18:19:03 mercador kernel: [ 3381.724822] nouveau 0000:01:00.0: fifo:
PBDM
A0: 00200000 [ILLEGAL_MTHD] ch 17 [003f4cc000 plasmashell[24734]] subc 0 mthd
00
38 data 00001111
.... more similar messages to follow ....

Also, there may have been other messages during other runs (because of a nasty
nature of a fault it's not always possible to capture them).

Also, it appears that only Plasma is affected: Gnome, Firefox (including WebGL
stuff), most KDE apps running stand alone appear to just work.

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