Re: Ad-hoc second monitor problem
Several of these problems sound like bugs in your desktop environment, where it fails to properly handle the screen resize events. How exactly are you "switching off TwinView"? Can you please run "xdpyinfo -ext XINERAMA" and attach the stuff at the bottom, starting at "XINERAMA version 1.1 opcode: foo", in both the successful and failing cases? If you're running with so-called desktop effects (i.e. compiz) running, please disable that and try again.