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I updated 12.04 this morning through the update manager (can't remember what it was, but it was only one thing) and everything was fine up until a few minutes ago when my screen changed and began flickering a partitioned white, red and green. I can't access any of the terminals so I'm not sure what to do.

Any help is appreciated.

Cheers.

Edit: I'm running a Dell Studio 1558 which has an ATI Mobility Radeon HD 5470

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Please provide more info like video card, etc. –  Frantique Jun 13 '12 at 15:45
    
Updated info on the main thread. –  Timsworth Jun 13 '12 at 16:05
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1 Answer 1

Create the file (as root) /etc/modprobe.d/radeon-kms.conf, and add the following line:

options radeon modeset=0

Reboot, and see what happens. It should fix your problem.

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