Red Hat Bugzilla – Bug 986074
Ongoing graphical corruption in GNOME when booting debug kernels in current Rawhide
Last modified: 2015-06-29 08:06:22 EDT
If I boot kernel-3.11.0-0.rc0.git7.1.fc20.x86_64 or kernel-3.11.0-0.rc1.git1.1.fc20.x86_64 - both of which have debugging symbols enabled (and I boot with slub_debug=-) - throughout my GNOME session I see constant artifacting, describable more or less as bits of the display 'disappearing' (I can see what's behind them, or the desktop) and then showing up again a few seconds later.
If I boot kernel-3.11.0-0.rc1.git0.1.fc20.x86_64 - which has debugging symbols disabled - I do not see this artifacting at all.
I don't see anything in journalctl that looks related, at a glance. My video adapter is a 01:00.0 VGA compatible controller : NVIDIA Corporation G94 [GeForce 9600 GT] [10de:0622] (rev a1) , using nouveau.
I'll attach a video showing the issue.
Interestingly, the artifacting stops happening if I turn on the Shell screen recorder - not just that it doesn't show up in the video (which I was half expecting), but it actually _stops happening_.
I'll try and get a video from my camera.
http://www.happyassassin.net/extras/debug_artifact.mp4 is a video from my camera showing some of the artifacting. Note I have two monitors, the video only shows the right hand one - the panel's on the other, if you're wondering where it is. I'm just typing in xchat and alt-tabbing to Firefox, you can see various artifacts going on.
With 3.11.0-0.rc5.git6.1.fc20.x86_64 the exact corruption described in the OP is not visible any more, but windows tend to flash when I'm switching between them, opening a new one or going to the overview. Still doesn't happen with non-debug kernels.
Reported upstream: https://bugs.freedesktop.org/show_bug.cgi?id=68453
This bug appears to have been reported against 'rawhide' during the Fedora 20 development cycle.
Changing version to '20'.
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