Re: Lenny: Flickering display with Radeon 9250 under X11
On Sun, 2008-10-05 at 16:22 +0200, Gerhard Pircher wrote:
>
> Recently I tried out Debian Lenny on my AmigaOne G4 with a Radeon 9250.
> I have a LCD monitor connected to it through DVI-I. Unfortunately the X
> server outputs a flickering display to which the monitor can't synchronize and
> thus is simply black most of the time. The same hardware configuration works
> fine under Debian Etch, thus I guess it is a problem with the X.org radeon
> driver. Did anybody else experienced this problem?
> I also included the X.org.log file, but as far as I can tell it doesn't show any
> information related to this problem.
It shows that the 1600x1200 mode has a pixel clock of 162 MHz, which is
close the single link DVI limit of 165 MHz. There are a couple of
reports of problems like this at http://bugs.freedesktop.org with
various suggestions for workarounds; IIRC the most workable ones come
down to using custom mode definitions, using either reduced blanking
periods or a lower refresh rate.
If you haven't yet, you might also want to try the driver upstream Git
snapshot from experimental, there have been some tweaks to the clock
programming code.
--
Earthling Michel Dänzer | http://tungstengraphics.com
Libre software enthusiast | Debian, X and DRI developer
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