This is not a qgis bug. Please follow the guidelines at:
https://wiki.ubuntu.com/X/Reporting
and report a bug against Xorg
(As a side note as an owner of a radeon card, I highly recommend
upgrading to ubuntu lucid, the radeon drivers have had many updates the
last year)
** Changed in: qgis (Ubuntu)
Status: New => Invalid
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launching QGIS freezes system with KDE Desktop Effects enabled
https://bugs.launchpad.net/bugs/376049
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