After upgrading to Linux kernel 3.2.6, rebooting, reconfiguring initramfs for encrypted drives, rebooting again, and reinstalling ati graphics, my normal xrandr command no longer worked. That command is:
xrandr --output LVDS --mode 1920x1200 --pos 1680x0 --rotate normal --output CRT1 --mode 1680x1050 --pos 0x0 --rotate normal --output DFP2 --off --output DFP1 --off
And the error was “xrandr screen only supports 1920 x 1200”
The fix is really simple….
Run the command:
Configure the dual monitors the way you normally would, but make sure the virtual screen size / Desktop Area is set to:
Exit from X completely (including any display managers like kdm/gdm/etc) and it will then work when you log back in. A quick tip, ctrl+alt+backspace usually will restart X.
Updated to include:
Don’t forget after installing a new kernel you have to do <as root>
update-initramfs -k 3.2.6