I have two FullHD monitors attached to my ATI graphics card [2]. The resolution of both of them is detected properly without any modifications to /etc/X11/xorg.conf. I can run both of them in clone mode. However, when I try to run them next to each other, I got the following error: The selected configuration for displays could not be applied. If tried to fix this according to [1]. My xorg.conf now looks like this:
Section "Module"
Load "glx"
EndSection
Section "Screen"
Identifier "Default Screen"
DefaultDepth 24
SubSection "Display"
# The 1088 is the smallest multiple of 32 >= 1088
# see manpages
Virtual 1920 1088
EndSubSection
EndSection
This does not seem to be parsed properly. After restarting X, I cannot set resolutions beyond 1600 or so any more. /var/log/Xorg.0.log gives:
[ 15.676] (II) fglrx(0): Not using mode "1920x1080" (width too large for virtual size)
[ 15.676] (II) fglrx(0): Not using mode "1680x1050" (width too large for virtual size)
Are my modifications syntactically incorrect? According to the man page, it should be fine. Any ideas?
OS: Ubuntu 11.10 64bit
[1] https://askubuntu.com/a/75546/5023
[2] 01:00.0 VGA compatible controller: ATI Technologies Inc Juniper [Radeon HD 5700 Series]
Best Answer
if you want both screens next to each other your virtual size must be at least
Virtual 3840 1080EDIT:
It seems like you need to extend the height too, so using
as xorg.conf works for me