Can't get dual screen to work

pieter557 pieter557 at
Mon May 26 14:03:20 UTC 2008

I have added the subsection into the xorg.conf file.
But I still can't put them next to each other. I can choose the
1680x1050resolution on my external display now. Anything lower and it
doesn't seem to work.
Now they're just cloned with the second at 1680x1050 and the laptop display
at 1280x800 on which i can only see a part of the screen.
( It's the same with the second at 1280x1024 )


On Mon, May 26, 2008 at 1:29 PM, Marius Gedminas <marius at> wrote:

> On Mon, May 26, 2008 at 10:47:26AM +0200, pieter557 wrote:
> > I'm having a problem with my dual screen setup ( not as easy as in
> windows
> > ).
> > I'm trying to have an extended desktop (just like in windows )
> > That's the only thing i really miss in ubuntu.
> > I have an  Intel Corporation Mobile GM965/GL960 Integrated Graphics
> > Controller.
> > My laptop is a fujitsu lifebook s6410 and my second display is a samsung
> > 2032mw.
> > The screen resolution program only gives me a max resolution of 1280*1024
> > while i should be able to do 1680x1050.
> > My laptop screen does 1280*800.
> You are hitting a limitation (read: bug, more specifically
> in the current video driver
> architecture that doesn't allow you to extend the desktop beyond the
> initial size.  There's a workaround: edit the /etc/X11/xorg.conf file as
> root, find the Screen section, and add
>        SubSection "Display"
>                Virtual         2048 2048
>        EndSubSection
> inside (replace 2048x2048 with whatever *maximum* size of the extended
> desktop you want).  Then reboot (or press Ctrl+Alt+Backspace to restart
> the X server) and you'll be able to use the Screen Resolution applet to
> get the extended desktop you want.
> There are two caveats: if you use 3D effects (aka Compiz), and switch
> between one display and extended desktop, sometimes part of the screen
> stops updating and you have to restart Compiz to unblock it.  (Alt+F2,
> type "compiz --replace", press Enter).  It's this bug:
> (window list in the panel stops
> updating) is somewhat related, and fixed with the same workaround.
> The other caveat is that if the total size of your desktop exceeds 2048
> pixels in any direction, you won't be able to use desktop 3D effects
> (part of the desktop beyond the 2048x2048 area will not be drawn).  It's
> this bug:
> and the workaround is a little bit more complicated (patching and
> recompiling Mesa and the intel video driver).
> Regards,
> Marius Gedminas
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