I some times get this if I have a large number of windows open. I
disabled visual effects. Problem went away. It said "could not enable
visual effects" when I tried to re-enable visual effects. I closed some
windows, including one which was frozen, and then it allowed me to re-
enable desktop effects. Problem became less serious.
Ubuntu 9.04 64 bit on Dual Core 2 with ATI Radeon 4650 RV730 PRO [Radeon
HD 4650], latest flgrx drivers. This machine has not problems with e.g.
Wobbly Windows.
Time to do 10 Alt-tabs:
Extra effects: ~10 seconds
Normal effects: ~9.4 seconds
No(ne) effects: Less than ~3.5 seconds
Extra effects afterwards: 4-7 seconds
Glxinfo reports:
direct rendering: Yes
server glx vendor string: ATI
I have added UseFastTLS to my Xorg to fix a crasher bug in Wine:
Section "Device"
Identifier "Configured Video Device"
Driver "fglrx"
Option "UseFastTLS" "2"
EndSection
You can benchmark to speed of Alt-tabs with the following line:
time for i in 0 1 2 3 4 5 6 7 8 9 ; do xvkbd -text '\A\[Tab]' ; done
--
Alt+Tab - switching applications delay. slow
https://bugs.launchpad.net/bugs/299330
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