Dual head with different resolutions, MGA G500

Simo Kauppi swk at nic.fi
Sat Sep 17 04:26:13 PDT 2005

On Thu, Sep 15, 2005 at 07:28:31PM -0400, Alex Deucher wrote:
> On 9/15/05, Daniil V. Kolpakov <dan at solutions.lv> wrote:
> > ? ????????? ?? Monday 05 September 2005 12:03 Simo Kauppi ???????(a):
> > > I know it works as I have used it before, but now I don't seem to get it
> > > working. When I set the xorg.conf to use dual head and start X, the
> > > screen just blanks. The only way to wake up the screen is to use fbset
> > > to set the resolution on either head. The fbset can only be done from
> > > another computer (via ssh connection) as the screen blanks totally.
> > > After the screen wakes up, the configuration seems to work fine.
> > 
> > Currently I'm running xorg-x11-6.9-0.cvs20050901.1mdk, same problem with
> > Xinerama, G550, and dual 1024x768 screens; I would like to point to another
> > workaround I'm using to wake up second head:
> > 
> > Xorg -config /etc/X11/xorg.conf.clone
> > 
> > where /etc/X11/xorg.conf.clone is a config file for a plain single-head
> > 1024x768.
> > 
> > I don't use fb console, and system boots up with one monitor blank. After X
> > starts in clone/single-head mode, it wakes up second monitor and I do
> > Ctrl-Alt-Backspace. From this moment linux text console is cloned on both
> > monitors (second wakes up), and Xinerama works OK.
> > 
> > --
> > /dev/brains: permission denied
> > 
> try the suggestion in bug 615:
> https://bugs.freedesktop.org/show_bug.cgi?id=615
> Alex

Thanks for the pointer. The patch doesn't seem to work for me :(

I think my problem is the fact that I use an LCD-display with DVI as the
first head. I've tried the same display with analog interface (connected
to the DVI with an adapter) but then it seems that it does not wake up at
all in the boot.

I'm only using framebuffer, because the only way to wake up
my first head in the dual mode is to issue fbset command.

My setup works in the 32-bit mode when I use the Matrox drivers, so I
guess I'll just have to wait until Matrox comes up with a driver for the
64-bit system :(

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