https://bugs.kde.org/show_bug.cgi?id=392083
Bug ID: 392083
Summary: Compositor, or something in kde5, causes nouveau
driver to hang with video playback
Product: kwin
Version: 5.12.3
Platform: Compiled Sources
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: kdeb...@cneufeld.ca
Target Milestone: ---
I'm afraid this is going to be fairly vague. There's something in KDE5 that
causes the nouveau driver to do a hard lockup when switching back from playing
video. I run MythTV in full-screen mode on one of my two monitors. In KDE4,
this wasn't a problem, but in KDE5, when using OpenGL or VDPAU rendering in
MythTV, it always hangs the nouveau driver. The screen locks up, the keyboard
is unresponsive. I can log in remotely and reboot the box.
I have another computer whose filesystem is the same (it's copied over via
rsync for all but bits of /etc). It runs KDE4, and it does not demonstrate
this problem.
I've tried all three rendering settings in KDE5, they all behave the same. The
dmesg output shows:
localhost kernel: nouveau 0000:01:00.0: mythfrontend[3151]: failed to idle
channel 19 [mythfrontend[3151]]
localhost kernel: nouveau 0000:01:00.0: mythfrontend[3151]: failed to idle
channel 19 [mythfrontend[3151]]
localhost kernel: nouveau 0000:01:00.0: fifo: runlist update timeout
localhost kernel: nouveau 0000:01:00.0: fifo: INTR 00000001: 0000000b
My video card on the non-functioning machine is NVIDIA Corporation GF106
[GeForce GTS 450] (rev a1)
The "xine" program also causes the same lockup in KDE5, but not in KDE4. It
also uses vdpau for rendering.
Again, sorry that this is vague. I can compile test patches and do more
investigation if somebody can direct me to interesting lines of enquiry.
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