Ubuntu
xserver-xorg-video-ati package

  1. Bug #156550
  2. Comment #10

Comment 10 for bug 156550

Revision history for this message
Tormod Volden (tormodvolden) wrote : Re: [gutsy] ati open source driver issues with external monitor

I read again your original description and wonder why I talk about a "ghost" screen :) You have a real screen on the laptop of course. I am just mixing up with other bug reports where there is only one real screen.

The problem is that with both screens enabled and in the default "clone" mode, the reported screen dimensions from the X server to the applications is the ones from the laptop screen and not the full virtual size reported by xrandr. Maybe the application (in this case gnome) uses the wrong method to probe for screen dimensions.

Can you please run xdpyinfo before and after the --off command and attach the output? e.g xdpyinfo > xdpyinfo-before.txt

I guess the ati driver is doing the right thing, but the X server or applications are not, so I reassign to xorg again. Ubuntu would also need a tool to correctly configure using xrandr1.2, and that's being worked on.