DESCRIPTION: Video artefacts on particular windows, especially when they are updating. Seems to happen more on some apps (Kate, Kpackagekit) than others. Some it happens on, but only infrequently. HOW TO REPRODUCE: 1. Use ATI video driver with EXA enabled. 2. Open kate. 3. Write some stuff. 4. Resize the window and scroll a bit. Within 30 seconds problem should be visible. TECH SPECS: ***machine 1 - happens more on this machine*** xserver-xorg-video-ati 1:6.12.1-0ubuntu2 (i386) from Ubuntu repos Kubuntu Jaunty 32bit (AMD dual core 64 bit cpu) ATI Technologies Inc RS482 [Radeon Xpress 200M] KDE 4.2.2 Xorg.conf: Section "Monitor" Identifier "Configured Monitor" EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" DefaultDepth 24 SubSection "Display" Depth 24 Modes "1280x800" Virtual 1280 800 EndSubSection EndSection Section "Device" Identifier "Configured Video Device" Driver "ati" Option "XAANoOffscreenPixmaps" Option "AccelMethod" "EXA" EndSection Section "ServerFlags" Option "DontZap" "False" EndSection Section "DRI" Mode 0666 EndSection Section "Extensions" Option "Composite" "Enable" EndSection ***machine 2 - happens less on this machine*** xserver-xorg-video-ati 1:6.12.99+git20090629.f39cafc5-0ubuntu1 (amd64) from Ubuntu repos Kubuntu Karmic 64bit (AMD quad core 64 bit cpu) ATI HD4850 KDE 4.2.98 (4.3 RC3) Default xorg (UXA?)
Please attach your xorg logs and configs. Does disabling the EXA DFS hook fix it? Option "EXANoDownloadFromScreen"
Just realised this probably isn't entirely EXA as it seems to happen (albeit less) on the machine I didn't enable EXA on (unless Karmic does that by default). Anyway, you can see a video demonstration (ogg video) at: http://www.mediafire.com/?g4gziwmcziz
xorg.conf is in the first post. I added the option suggested and that seems to clear it up perfectly (at least thus far). Thanks!
Created attachment 28216 [details] Xorg.0.log - no visible errors
Created attachment 28217 [details] Updated xorg.conf
Gah! Spoke too soon. It's still there, although now artefacts occasionally seem to dissapear after about 1/2 a second.
Does Option "EXAOptimizeMigration" "off" work around the problem? If so, that's the default upstream since xserver 1.6.2, Ubuntu should follow suit.
Hmmm... That does indeed seem to work around the problem. I'll take this up on Ubuntu's bug tracker. Thanks for the help everyone!
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