Your logs report this error:
(EE) RADEON(0): RADEONWaitForIdleCP: CP idle -22
(EE) RADEON(0): Idle timed out, resetting engine...
(EE) RADEON(0): RADEONWaitForIdleCP: CP reset -22
(EE) RADEON(0): RADEONWaitForIdleCP: CP start -22
It seems an Ati driver problem, so I reassign this to xserver-xorg-
video-ati package for more investigations. Please attach the output of
lspci --vvnn that may be useful for future triagers. Thanks for your
collaboration.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Sourcepackagename: kdebase => xserver-xorg-video-ati
** Changed in: xserver-xorg-video-ati (Ubuntu)
Assignee: Marco Maini (maini10) => (unassigned)
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[gutsy] kdm crashes when randr is enabled
https://bugs.launchpad.net/bugs/147361
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