Radeon X300, dual head

Hans J. Koch hjk at linutronix.de
Fri Nov 21 16:26:08 PST 2008

On Fri, Nov 21, 2008 at 03:53:51PM -0800, James Purdy wrote:
> Hi,
> I am using the exact same setup on the exact same harware.  Radeon X300 + 2
> 1680x1050 monitors.  This may not be the best solution, but I use a shell
> script that runs after xorg starts with the command:
> xrandr --output DVI-0 --right-of VGA-0
> and it spread a single desktop across 2 monitors.  Adjust --right-of and
> --left-of as necessary... of course your mileage may vary.

Yes, of course that's how it should be and what I tried first. This still
gives me the same output on both monitors.

I also configured a virtual screen size of 3360x1050 in xorg.conf, and tried
to push the second monitor to the other half of the screen with
xrandr --output VGA-0 --pos 1680x0, but that doesn't help either. All I can
achieve is a bigger screen size, I mean, the mouse cursor can be moved beyond
the left or right border of the screen. But it just disappears, I can never
see the other half of the screen. And it's always the same content on both


> James
> On Fri, Nov 21, 2008 at 2:50 PM, Hans J. Koch <hjk at linutronix.de> wrote:
> > Hi,
> > I used to have a working system with a Radeon X300 (RV370) card and two
> > monitors 1680x1050 each. I used an ancient xorg version (something like
> > 6.8, can't recall) and had a MergedFB+Xinerama configuration. Worked well
> > for me.
> >
> > A few days ago I dist-upgraded my Debian sid which brought me version
> > 7.3 of xserver-xorg. Since that I'm trying to get my dual head setup
> > working again...
> >
> > I understand that MergedFB has been replaced by RandR 1.2 extensions.
> > Sounds like a good concept to me, but unfortunately it doesn't work here.
> >
> > X correctly detects my hardware, but no matter what I do, I always have
> > the same output on DVI-0 and VGA-0. I googled around and found a lot of
> > pages describing how to setup xorg.conf, and I think it's OK.
> >
> > Question: Is this supposed to work or a known problem? What do I have
> > to do to get a working dual head setup again?
> >
> > Thanks,
> > Hans
> >
> > _______________________________________________
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> > xorg at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/xorg
> >

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