Hi, I have perhaps a variation of this problem.

I have a Dell laptop with a broken monitor, so I use it as a desktop with an 
external monitor.
It has an ATI Radeon Mobility card in it. I see this problem since I upgraded 
to Gutsy, but also when I run both the Ubuntu as well as Kubuntu live-CDs. 
Feisty installation worked fine, as well as the Feisty live-CD works fine.

What I see in addition to already reported:
1. The log-in screen as well as the splash-screen after giving username and 
password shows this behavior
2. When I press the "K" button to bring up the menu, the menu pops up half-way 
up the screen, on the bottom of the top-left 1024x768 corner, I presume.
3. Maximizing a window only maximizes it to the top-lef 1024x768 part of the 
monitor.

However, running the xrandr command to shut off LVDS doesn't seem to do 
anything.
xpyinfo as well as xrandr shows identical information before and after, and 
nothing changes on the screen.

** Attachment added: "xrand-before-and-after"
   http://launchpadlibrarian.net/10238646/xrand-before-and-after

-- 
gnome uses wrong screen size - does not fill the screen
https://bugs.launchpad.net/bugs/156550
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