[Nouveau] [Bug 91598] Broken Rendering of Plasma 5 Desktop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91598

--- Comment #13 from David March <davidmarch007 at gmail.com> ---
Just wanted to add that this also can be replicated on KDE4 (I have since
downgraded to get a usable system) as well (although far more rare).  In this
case it is a freeze (sometimes indefinite) but I do not notice any visible
graphical corruption yet.  The same (mostly - kwin is listed rather than
plasmashell, of course messages as above are in the log like so:

(Note reverse order - output generated  using 'journalctl -r'
--------

Sep 06 12:42:39 gentoot3400 kernel: nouveau E[  PGRAPH][0000:01:00.0] TRAP_PROP
- TP 0 - e0c: 00000000, e18: 00000000, e1c: 000807f0, e20: 00002a00, e24:
00030000
Sep 06 12:42:39 gentoot3400 kernel: nouveau E[  PGRAPH][0000:01:00.0] TRAP_PROP
- TP 0 - RT_FAULT - Address 0047a7f200
Sep 06 12:42:39 gentoot3400 kernel: nouveau E[     PFB][0000:01:00.0] trapped
write at 0x0047a79000 on channel 0x0000f949 [kwin[1926]] PGRAPH/PROP/RT0
reason: PAGE_NOT_PRESENT
Sep 06 12:42:39 gentoot3400 kernel: nouveau E[  PGRAPH][0000:01:00.0] ch 4
[0x000f949000 kwin[1926]] subc 3 class 0x8297 mthd 0x1b0c data 0x1000f010
Sep 06 12:42:39 gentoot3400 kernel: nouveau E[  PGRAPH][0000:01:00.0] TRAP_PROP
- TP 0 - e0c: 00000000, e18: 00000000, e1c: 0000079e, e20: 00002a00, e24:
00030000
Sep 06 12:42:39 gentoot3400 kernel: nouveau E[  PGRAPH][0000:01:00.0] TRAP_PROP
- TP 0 - RT_FAULT - Address 0047a79000
Sep 06 12:42:39 gentoot3400 kernel: nouveau E[kwin[1926]] validate: -22
Sep 06 12:42:39 gentoot3400 kernel: nouveau E[kwin[1926]] validating bo list
Sep 06 12:42:39 gentoot3400 kernel: nouveau E[kwin[1926]] fail set_domain
Sep 06 12:42:39 gentoot3400 kernel: nouveau E[kwin[1926]] validate: -22

---------

So the issue is not just really an issue related to Plasma 5 although it is
worse on Plasma 5.  Again it does seem to occur far less often with KDE4
though.

New System Info:

Linux gentoot3400 4.2.0-gentoo #1 SMP Mon Aug 31 17:07:28 EDT 2015 x86_64
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz GenuineIntel GNU/Linux

media-libs/mesa-11.0.0_rc2
x11-drivers/xf86-video-nouveau-1.0.11
kde-base/kwin-4.11.22(4)
x11-base/xorg-server-1.17.2-r1

(with compositing ON)

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