Same bug here, just installed Ubuntu 9.04 yesterday, I was using
wallpaper-tray from synaptic and as usual set it so that my wallpaper
change every minute and I found that every minute, in top, Xorg took up
to 97% of my CPU and was lagging the whole system for about 5 to 15
seconds. It do appear it is because of the fade in effect when changing
wallpaper because it worked great with Ubuntu 8.10 and there wasn't any
fade effect. I am using a GeForce FX 5600 with the proprietary drivers
and in visual effects in Appearance I selected None (so no compiz).
I tried using Option "MigrationHeuristic" "greedy" and Option
"UseEvents" "on" in section Device in xorg.conf but to no avail.
Here's the line from top that shows it :
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2641 root 20 0 88988 52m 9420 R 97.6 10.6 1:37.32 Xorg
My xorg.conf is quite simple :
Section "Device"
Identifier "Configured Video Device"
Driver "nvidia"
EndSection
Section "Screen"
Identifier "Default Screen"
Device "Configured Video Device"
Monitor "Configured Monitor"
DefaultDepth 24
Option "AddARGBGLXVisuals" "True"
Option "NoLogo" "True"
SubSection "Display"
Depth 24
Modes "nvidia-auto-select"
EndSubSection
EndSection
--
Changing desktop background eats up all available CPU time
https://bugs.launchpad.net/bugs/376030
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