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

[Alex Deucher]

On Sat, Sep 18, 2010 at 11:52 AM, Einar Ingebrigtsen <ein-ing at online.no> wrote:
>  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?


Can you try this set of kernel patches (against 2.6.36):
http://people.freedesktop.org/~agd5f/pll_fixes/

Alex

>
>
> Regards, Einar
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