Re: Matrox G550, dual head, 1680x1050

["Hans-Jürgen Koch" <hjk@linutronix.de>]

Am Freitag, 2. März 2007 00:49 schrieb Hans-Jürgen Koch:
> Am Freitag, 2. März 2007 00:29 schrieb Alex Deucher:
> > On 3/1/07, Hans-Jürgen Koch <hjk@linutronix.de> wrote:
> > > Hi,
> > > I'm the proud owner of two NEC MultiSync 2070WNX monitors (1680x1050)
> > > and a Matrox G550 dual DVI card. I'm now trying to set up a dual head
> > > configuration with this equipment.
> > >
> > > I'm booting with video=matroxfb:vesa:0x1BB, as there is no 1680x1050
> > > vesa mode. This works, both monitors show the same and complain about
> > > the wrong resolution.
> > >
> > > Now I start my X server (xorg.conf below) and wish to get a xinerama
> > > setup. Monitor 1 switches to 1680x1050 and shows a nice clean screen.
> > > Monitor 2 seems to have problems, though. I guess the card still
> > > outputs the 1280x1024 set up at boot time. Colours are correct, but the
> > > image is heavily distorted. It looks like the X server thinks it's
> > > 1680x1050 but in fact it's still 1280x1024.
> > >
> > > I spent some time googling, but to no avail. Now my questions:
> > >
> > > Is this a known limitation of matroxfb?
> > > If yes, is it considered a bug? I could spend some time looking into
> > > the code. Do I have any chance to get this working in a reasonable dual
> > > head configuration? Any hints?
> >
> > IIRC, the current mga X server doesn't know how to deal with DVI
> > (single or dual ports).  DVI was only supported with matrox' binary
> > module.
>
> Hi Alex,
> thanks for your fast reply.
> Currently, I've got both monitors connected with VGA cables. The card has
> some proprietary 60-pin or so connector, and I've got an adapter caple from
> that plug to 2xVGA. Both monitors show a stable picture, but only the
> picture on monitor #1 is usable. It really looks like the X server is
> trying to switch both channels to 1680x1050, but only succeeds with the
> first one.
>
> Hans

BTW, even xinerama "works": I can move the mouse cursor to the second monitor 
and it appears there, but also heavily distorted.

Hans


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