Re: Matrox (g450) DVI problems in 2.6.17

["Michal Suchanek" <hramrach@centrum.cz>]

On 9/25/06, Petr Vandrovec <vandrove@vc.cvut.cz> wrote:
> Michal Suchanek wrote:
> > Hello from the Matrox DVI land
> >
> > For me matrox DVI framebuffer (sort of) works on Linux 2.6.16.19 and
> > fails on 2.6.17.13.
> >
> > The DVI support on Matroxes is quite flaky I'd guess.
>
> Ask Matrox to release documentation for their hardware...
Well, it looks like nobody releases the docs for thier graphics hardware...
>
> > I got a matrox g450
> >
> > 01:00.0 VGA compatible controller: Matrox Graphics, Inc. G400/G450 (rev 85)
> >
> > and I connect it with DVI to a flat panel.
>
> > For X to work I have to use kernel framebuffer to set the videomode
> > (UseFBDev in X). Otherwise X fails to set the timings correctly
> > (nothing is visible).
> > With kernel framebuffer I get an usable videomode in two steps. First
> > I start the X server, and there is only a message from the monitor
> > about bad timings. However, after switching to the console and back X
> > works well. Sometimes the switch is not needed (usually if started
> > from an already running X server). Works with software suspend as well
> > (as long as dri is not used).
>
> Are not you using ACER's monitor?  Try just powering monitor off and back on
> instead of doing mode switch.

It's an EIZO display. Switching the mode is easier than pressing the
power button but I can try that when I get to start the X server
again.

>
> > With 2.6.17.13 the picture I get is noisy. The lines shift a few
> > pixels horizontally in various directions. It is much like the results
> > I got with g550 when there was no screen connected to DVI at startup.
> > only much more noise (there must be a screen connected to DVI at boot
> > for the framebuffer to work correctly with DVI - at least it had to
> > last time I tried).
>
> Upgrade to 2.6.18, it should behave like 2.6.16 does.
I will try. Thanks

Michal

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