Can Xinerama be completely disabled in Gutsy?

Todd Deshane deshantm at
Thu Nov 22 00:41:40 UTC 2007

On Nov 21, 2007 11:56 AM, Dan Munckton <lists at> wrote:

> Hi
> I'm trying to find a workaround for the following Java problem:
> #154613: Xinerama prevents Java fullscreen exclusive mode in Gutsy
> []
> Java uses Xrandr to achieve its Fullscreen Exclusive Mode, but rightly
> avoids using it if Xinerama is in use. So Java Fullscreen Mode is only
> possible when Xinerama is not reported present in the running Xorg.
> In both Feisty and Gutsy Xinerama appears to be built-in. In Feisty
> Xinerama isn't reported as present/active (using XQueryExtension() etc),
> in Gutsy it is.
> So as a workaround I need to find a way to completely deactivate and
> disable Xinerama in Gutsy.
> In the xorg.conf manpage it indicates that adding the following option
> in the "ServerFlags" section should disable it, but it's not.
> Section "ServerFlags"
>  Option "Xinerama" "off"
> EndSection
> After restarting X I check in /var/log/Xorg.0.log and find the option is
> recognised/parsed but still when I test Java and also query Xorg
> directly using the Xlib API it still shows as present.
> So I have the following questions:
> 1) What is the major difference between the way Xinerama is included in
> Gutsy in comparison with Feisty?

I had strange mouse behaviour in gusty with the same config file that I had
used fine in feisty.

> 2) Is it going to be possible to disable Xinerama from within xorg.conf?

Yeah. The way I got it to work was with an aticonfing command, specifically:

  sudo aticonfig --dtop=horizontal,reverse

This command sets up what is called a big desktop, not xinerama, which
basically uses both displays as one big one.

If you are using an nvidia card, try configure with the nvidia-settings and
those tools.

> 3) If I disable Xinerama what am I likely to break (e.g.
> DisplayConfigGTK)?
> 4) Is there another way to achieve this?
> I am quite happy plugging away at this on my own but if anyone with more
> Ubuntu/Xorg knowledge can give me some insight at this stage it would be
> much appreciated.

There are some good tutorials on this stuff:

If you run into specific problems, you shoud post bugs on them. Be sure to
include your config files, monitor specs, and graphic card information and
other relevant inforation

Best Regards,

> Cheers
> Dan
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