Comment 2 for bug 23902

(In reply to comment #0)
it seems it concerns only old cards (9200, 9000, perhaps 7500 ?)

it seems it's an "xorg bug"
because here is a post from a man on fedora4 :
https://bugs.freedesktop.org/show_bug.cgi?id=2506
(it could be in relation with that :
https://bugs.freedesktop.org/show_bug.cgi?id=2506 )

Here are some ubuntu users :
http://ubuntuforums.org/showthread.php?t=70432
http://www.ubuntuforums.org/showthread.php?t=74011
http://www.ubuntuforums.org/showthread.php?t=80466
http://forum.ubuntu-fr.org/viewtopic.php?id=14420