Bug#508066: xserver-xorg-video-radeon: external display not work on ATI Technologies Inc Radeon Mobility U1
Robert Heel wrote:
> No, no change... The monitor also would display an error message in case of a not supported signal.
> Tried ubuntu, too - same problem.
>
> Is there a possibility to deactivate xrandr to switch back to old functionality?
>
No, you can't disable RandR 1.2.
But if you happen to know which mode your internal and external display
like, so can use ModeLine+PreferredMode to enforce them by default in
xorg.conf. See http://wiki.debian.org/XStrikeForce/HowToRandR12 sections
III.1 and III.5.
Brice
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