[Bug 556232] Re: Radeon HD 2600 - Dualscreen problem

[Etienne Duble]

A workaround in to disable KMS at boot: I added radeon.modeset=0 in the kernel options of the grub configuration and the problem seemed to disappear. 
Here is the related line in /boot/grub/grub.cfg:
 linux   /boot/vmlinuz-2.6.32-21-generic root=UUID=2aa5a050-dd81-4fca-83ba-c269a8dbdc96 ro   quiet splash radeon.modeset=0

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Radeon HD 2600 - Dualscreen problem
https://bugs.launchpad.net/bugs/556232
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