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[Konstantinos Togias <ktogias@xxxxxxxxxxxxxxx>]

I have the same problem. Ubuntu 11.04 64bit, clean installed, fully
updated. Linux media 2.6.38-11-generic #48-Ubuntu SMP Fri Jul 29
19:02:55 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux . I have configured
auto-login at unity on boot.

Some times (not always but quite frequently) upon bootup, screen
flickers in a rate once in about 10sec, while screen contents are
partially rendered with various artifacts and distortions. Mouse and
keyboard have very slow or no responsiveness.

Pressing ctrl+alt+F1 repeatedly until I manage to get to the text
console, and then loggin in and runnig sudo /etc/init.d/gdm restart
solves the problem.

My VGA is 01:00.0 VGA compatible controller: ATI Technologies Inc RV710
[Radeon HD 4350] and X use the opensource RADEON driver.


** Attachment added: "kern.log part from boot to gdm restart"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/728923/+attachment/2411503/+files/kern.log

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https://bugs.launchpad.net/bugs/728923

Title:
  [Natty] WARNING: at
  /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248
  radeon_fence_wait+0x36f/0x3e0 [radeon]()

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