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[Sam_ <774909@xxxxxxxxxxxxxxxxxx>]

As for the second crash forgot to mention I let the screen blink only two or three times and survived with alt+sysrq+k. After login everything was normal again. As for today I've tried to trigger the behaviour open lots of apps fast, clicked on launcher multiple times and move launchers back and forth, no crash yet. 
I wonder if there is a certain time range when screen starts blinking. Sensors also don't show any significant change (screenshot). 
Unable to make a screenshot during screen blinks between black and desktop, it just displays the desktop few seconds (launcher and background), compiz obviously disabled, no cube or cube cap visible (cube is set transparent).
Also I'd like to add regression tag since the the issue never happened with Maverick or any other version since Edgy. Graphic card is the same as in Maverick.

** Attachment added: "sensors.png"
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/774909/+attachment/2105810/+files/sensors.png

** Tags added: regression

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https://bugs.launchpad.net/bugs/774909

Title:
  radeon GPU lockup CP stall for more than 10000msec