Virtual screen resolution are not update properly in xorg.conf file.

[ikus060]

Binary package hint: gnome-control-center

In Karmic, using the 'Display' to setup the dual head monitor setting result in the virtual resolution not being set properly.

Step to reproduce:
1- Start gnome-display-properties
2- Enable two monitors with mirroring.
       -1920x1080 + 1400x1050
3- Click OK
4- A message box ask me if I want to change the virtual screen resolution.
5- I Answer 'Yes'
6- I logout and login
7- Looking at xorg.org file the tool have set the virtual resolution to 2048 x 2048

***The value use for the virtual resolution are the maximum resolution for 3D support of my graphic card.

Hardware details :
- ThinkPad T43 2668-95U
- External monitor : Acer H233H

ProblemType: Bug
Architecture: i386
Date: Thu Oct 8 15:40:48 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/gnome-display-properties
Package: gnome-control-center 1:2.28.0-0ubuntu4
ProcEnviron:
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-12.41-generic
SourcePackage: gnome-control-center
Uname: Linux 2.6.31-12-generic i686

[Alberto Milone (albertomilone)]

This is more of a workaround than a bug (so that you can switch to higher resolutions without breaking 3D acceleration).

1) Are you experiencing problems with the virtual resolution set to 2048 x 2048?
2) What graphics card are you using?
3) Can you attach your /var/log/Xorg.0.log , please?

[ikus060 (ikus060-renamed)]

Ok, I understand the point, but it's not the expected behaviour. The best would be to make that distinction. So If I setup the dual head monitor so that the virtual screen resolution is greater than the maximum 3D resolution of the card, it's should notify the user about it at the same time it's asking update the virtual screen resolution automatically.

Here is my video card :
VGA compatible controller: ATI Technologies Inc M22 [Mobility Radeon X300]

[ikus060 (ikus060-renamed)]

Any update ?