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

[Etienne Duble]

Apparently it is not recommended to modify /boot/grub/grub.cfg directly (because this file will be overwritten next time update-grub is called) 
A cleaner way to disable KMS is to modify /etc/default/grub instead, by specifying:
GRUB_CMDLINE_LINUX="radeon.modeset=0"
and call update-grub.

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