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]
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
Have you checked the output of
/var/log/Xorg.0.log? Your Screen section looks correct, what does your Monitor section look like?If checking your Monitor sections doesn't fix your issue, my next step would be to remove some of your GUI based settings files.