mrg, this bug report is being closed due to your last comment
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
ati/+bug/577288/comments/3 regarding this being fixed with an update.
For future reference you can manage the status of your own bugs by
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** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/577288
Title:
slow/lockup on window switching, displaying scrolling pixmaps, etc
Status in “xserver-xorg-video-ati” package in Ubuntu:
Invalid
Bug description:
Binary package hint: xserver-xorg-driver-ati
Ubuntu 10.04 LTS Lucid
xserver-xorg-driver-ati 6.13.0-1
possibly: xserver-xorg 7.5-5
window manager: KDE 4.4.2
This bug is similar to
https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/568988 but is
NOT limited to compositing. The system will freeze for a second or two whether
compositing is on or off when certain user interface functions are called. Xorg
CPU usage is 100% and takes priority from other system processes. The mouse
will not respond and if audio is playing it will stutter.
User interface functions affected are: window switching (changing focus),
window open, scroll frame, viewing an image
Functions NOT affected: window minimize/maximize, desktop cube, present
windows, most effects
This bug occurred in previous ubuntu version 9.10 but was fixed with the
workaround:
Option "MigrationHeuristic" "greedy" in xorg.conf
This option no longer has any effect.
These options improve scrolling speed/smoothness on GTK based applications
only.
Option "EXANoUploadToScreen" "1"
Option "EXANoDownloadFromScreen" "1"
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