View Full Version : [ubuntu] Dual Display - required virtual size does not fit available size

October 7th, 2011, 02:37 AM
I just installed 11.10 rc and I changed my ATI settings (dual monitor) and after reboot I cant use dual monitor any more

It seems the "Display" app in ubuntu wont allow me to use dual monitors. I get the error

"required virtual size does not fit available size: requested=(2304, 768), minimum=(320, 200), maximum=(1280, 1280)"

and because I can't get both monitors active (except mirrored) I can't use dual display in ATI ccc

Update. not exactly sure what caused it but the problem was xorg.conf
seems the old xorg.cofg was renamed to xorg.conf.dist-upgrade-201110070100
and the new xorg.conf only had in it

Section "Screen"
Identifier "Default Screen"
DefaultDepth 24
Section "Module"
Load "glx"

so I restored the old xorg.conf and everything works.

October 19th, 2011, 05:03 PM
Just upgraded and the same exact thing happened. This kind of stinks.

October 19th, 2011, 05:12 PM
First, in terminal you need to:

gksudo amdcccle

Then, head over to display manager -> multi display

Select Multi-display desktop with display(s)

Apply this and restart. It worked for me.


October 21st, 2011, 07:26 PM
After upgrading to 00, dual monitor support was OK with my 2 1920x1200 monitors rotated. I noticed that the mouse tracking was slow over Chrome. So, I did the additional drivers install of the ATI proprietary driver. Mouse tracking was full speed, but now I only had one display mirrored. I didn't have a backup xorg.conf in my /etc/X11. The xorg.conf was bare. Running Catalyst Control Center would exit without asking me to apply changes. Mofifying the xorg.conf file to have a Display subsection with a larger virtual size, followed by running CCC worked for me.

Section "Screen"
Identifier "Default Screen"
Device "Default Video Device"
DefaultDepth 24
SubSection "Display"
Virtual 2400 1920

CCC wrote out an a full xorg.conf file and all is well now.