Created attachment 27586 [details]
Forwarding this report from Ubuntu reporter pixolex:
Laptop with S-Video connected and configured in gnome-display-properties, with virtual resolution specified in xorg.conf shows black screen with moving mouse on laptop and TV after reboot.
1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu.
Description: Ubuntu 9.04 (Release Candidate upgraded from Ubuntu 8.10)
2) The version of the package you are using, via 'apt-cache policy packagename' or by checking in Synaptic.
3) What you expected to happen
After attached the S-Video cable to my laptop, configured the position of the 2 properly detected monitors in gnome-display-properties, updated automatically the xorg.conf with the respective virtual resolution and , finally, logout and login, I expected to have an expanded dual monitor desktop with my laptop and TV (to see fancy films with my laptop in the TV :P).
4) What happened instead
I did every thing what I described in point 3, and all I got was a white screen in the TV and in the laptop. If I made alt-tab I also got some little icons, but every thing around was white.
I manually edited xorg.conf, erased the virtualscreen resolution and booted again without the TV attached. I disabled all the desktop effects and tried every thing again, and, more or less, it worked. The bigest problem is that I can't open any film with this configuration, any video application crash silently when trying to play a film.
I've tested the Karmic Alpha 2 Live CD and the white problem is now a black problem. After the S-Video cable attached to my laptop, configured the position of the 2 properly detected monitors in gnome-display-properties, updated automatically the xorg.conf with the respective virtual resolution and , finally, logout and login, the two displays (laptop and TV) were black. It's just possible to see the mouse arrow moving and a thin (1 pixel wide) line of the desktop in the left side of the laptop screen, all the rest of the desktop (laptop and TV) was black.
If the option is "mirror" it works, the laptop changes to 1024x768, like the TV, and it seems the 3D effects are working. I couldn't test the video because there are no VLC in the repos.
00:00.0 Host bridge : Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub [8086:27a0] (rev 03)
Subsystem: ASUSTeK Computer Inc. Device [1043:1267]
00:02.0 VGA compatible controller : Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
Subsystem: ASUSTeK Computer Inc. Device [1043:1252]
1. Since you are able to use Karmic Alpha2, let's forget 9.04.
2. Let's focus on the issue of virtual resolution setting in this bug. And please file separate bugs for the rest issues (though I don't see what's the problem for compiz).
3. You need tell the specific "virtual resolution specified in xorg.conf". I'm afraid if it exceeds 2048 so falling into bug#21190.
(In reply to comment #1)
> 1. Since you are able to use Karmic Alpha2, let's forget 9.04.
> 2. Let's focus on the issue of virtual resolution setting in this bug. And
> please file separate bugs for the rest issues (though I don't see what's the
> problem for compiz).
> 3. You need tell the specific "virtual resolution specified in xorg.conf". I'm
> afraid if it exceeds 2048 so falling into bug#21190.
It's like you have said, please see my comment downstream.
or more accurate, it's bug#22076.
*** This bug has been marked as a duplicate of bug 22076 ***