[Nouveau] GeForce FX5200 dual DVI & Samsung 204b

Pekka Paalanen pq at iki.fi
Mon Sep 27 14:41:17 PDT 2010

On Sat, 25 Sep 2010 16:04:23 +0200
Grzesiek Sójka <pld at pfu.pl> wrote:

> Im using GeForce FX5200 dual DVI graphics adapter connected with
> two Samsung 204b monitors. At the moment I'm using binary nvidia
> drivers and everything works fine but I'm forced to switch to
> nouveau. Unfortunately there are problems. It seems that
> nouveau.ko wrongly detects the PixelClock of my monitors. More
> precisely, after loading of nouveu.ko the screen starts to blink.
> According to my experience the problem is too hight PixelClock.
> Moreover, in the /var/log/Xorg.0.log you can find the line:
> NOUVEAU(0): Ranges: V min: 56 V max: 75 Hz, H min: 30 H max: 81
> kHz, PixClock max 175 MHz
> which is false. The maximum PixClk for Sumsung 204b is 162MHz. I
> was trying to play with the video= kernel parameter but there is
> no way to force the PixClk.

Are you saying that forcing a low-refresh-rate mode via video=
kernel argument does not help?

But you still do get a good picture on the framebuffer console,
do you not? In that case, X is overriding what kernel thinks is
the best mode, so you should clean up the X config.

If wiping the X config does not help, post kernel and X logs.


Pekka Paalanen

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