Comment 10 for bug 277948

Created an attachment (id=23120)
Xorg.0.log

Forwarding this report from a Ubuntu reporter:
https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/277948

[Problem]
Upon disabling mirroring and logging back in, the virtual screen size is that of one screen, not both.

This was confirmed as still happening on 6.11.0, but was first reported on Ubuntu Intrepid on 2008-10-03

[xrandr output]
Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 3360 x 1050
LVDS connected 1680x1050+1680+0 (normal left inverted right x axis y axis) 331mm x 207mm
DVI-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 434mm x 270mm

For things to behave properly, Screen 0 needs to be 3360x1050, which can be manually set using xrandr --output S -s 3360x1050. Having this wrong breaks the nautilus desktop, for example.

[Original Report]
Binary package hint: nautilus

Using Intrepid with the open source ati driver, two screens, and compiz enabled results in nautilus only running on one screen.

I configured dual head using the Monitor Resolution Settings program. After restarting X for a virtual screen size config write, I come back in to find that one desktop is not getting redrawn. So dragging a window across the broken desktop results in the window contents getting drawn across the desktop, for example. Otherwise the screen itself works fine: Panels can be moved on and they function fine. I can use all the programs I want on the screen, and move other ones on to it.

Using "xprop | grep WM_CLASS" on the working desktop returns
  WM_CLASS(STRING) = "desktop_window", "Nautilus"
while using it on the broken desktop returns nothing.

It seems that nautilus is simply not running on the one screen.

I've confirmed I have 6.11.0 in my Xorg.log, and while the update unfortunately did not fix the issue, I did find something in testing: attempting to turn off the LCD in Display Settings takes an inordinate amount of time to fail, but afterwards the screen size is set correctly.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 8.10
Uname: Linux 2.6.27-4-generic i686