Flickering on external monitor - no problems on built-in-monitor. ATI HD 4550

[Einar Ingebrigtsen]

  Hi

Im running on a hybrid with ATI Radeon HD 4550 and the integratet intel 
gpu (currently im only using the radeon, since I've havent managed to 
use vga_switchero --> radeon is activated by default)

Im using ofcourse the xorg-radeon driver, and it works great on my 
laptop. But on my external monitor (connected via VGA-port) the image is 
flickering, i have tried different resolutions, but with the same 
result. Because of this problem im running dual-boot with win 7, there 
there are no problems with the external monitor.

I've read bugreport conserning other ati-cards but not the 4xxx-series 
where the solution would be to set the KMS=0 in the xorg.conf, this 
didnt have any possitive effect concerning my problem.

Does anyone know what the problem can be? Any logs I should check to get 
any answers?


Regards, Einar