Re: Matrox G550, dual head, 1680x1050

Am Freitag, 2. März 2007 00:29 schrieb Alex Deucher:

On 3/1/07, Hans-Jürgen Koch [off-list ref] wrote:

quoted

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

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