Radeon and flat-panel flickering

Russell Shaw rjshaw at netspace.net.au
Wed Apr 18 07:15:44 PDT 2007

Alex Deucher wrote:
> On 4/17/07, Russell Shaw <rjshaw at netspace.net.au> wrote:
>> Hi,
>> With a radeon 9550 card and a mitsubishi DV-175 lcd monitor, the screen
>> has "static" in the form of bursts of noisiness of 20-50 horizontal 
>> pixels,
>> like you'd expect from a broken cable. Occaisonally the screen would 
>> roll or
>> blink too. The DVI-I cable is ok however.
>> I was using the open source radeon driver in a recent Xorg setup.
>> The noisiness is present in console mode and when xorg.conf is set up
>> for the monitor in it's native 1280x1024 resolution. With xorg.conf
>> set for 1024x768, the noisiness goes away. Installing the ATI fglrx
>> driver also eliminates the noise.
> try setting:
> Option "DisplayPriority" "HIGH"
> in the device section of your config file.

I tried it, but that didn't have any effect.

How do you debug a problem like this?

Normally i'd just read the data sheet then review the code. None of
that's possible with X.

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