Can Xinerama be completely disabled in Gutsy?

[Todd Deshane]

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

> Hi
>
> I'm trying to find a workaround for the following Java problem:
>
> #154613: Xinerama prevents Java fullscreen exclusive mode in Gutsy
> [https://bugs.launchpad.net/ubuntu/+source/sun-java6/+bug/154613]
>
> 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:
http://ubuntuforums.org/showthread.php?t=221174


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,
Todd


>
> Cheers
>
> Dan
>
>
> --
> Ubuntu-devel-discuss mailing list
> Ubuntu-devel-discuss at lists.ubuntu.com
> Modify settings or unsubscribe at:
> https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/ubuntu-devel-discuss/attachments/20071121/74e8a17c/attachment.html>