Solution to setting "the virtual size is greater than the available size" for ubuntu multi-screen

Ubuntu multi-screen setting "virtual size greater than available size" solution: after the new ubuntu12.04 is installed with the video card driver, the dual-screen cannot be scaled normally, so the configuration display on the configuration management side reports an error: "The required virtual size is greater than the available size: demand = (3360,105 0), minimum = (320,200), maximum = (1680,168 0)" to set xorg. conf and ubuntu12.04 do not have this file by default, so you need to generate it. Press ctrl + alt + f1 to the text mode, stop the Xwindow service, and run sudo/etc/init. d/lightdm stop and generate xorg. conf sudo X-configure generates an xrog in the main directory. conf. new. copy the file to/etc/X11/xorg. conf is not enough. If the virtual screen size is not set, run sudo/etc/init. d/lightdm start return to xwindow to edit xorg. conf. new and then copy it. The following section is changed. modes is the resolution of each screen, and Virtual is the total resolution of all screens. [Plain] Section "Screen" Identifier "Screen0" Device "Card0" Monitor "Monitor0" SubSection "Display" Viewport 0 0 Depth 24 Modes "1680x1050" Virtual 3360 1050 EndSubSection EndSection again ctrl + alt + f1 switch back to text mode, switch the lightdm service sudo/etc/init once. d/lightdm restart ctrl + alt + f7 after switching back to xwindow, you can use the screen settings in the settings to set multiple screens without the resolution being insufficient.