Looking around I found that the problem is already known and a workaround is available. I attach the port of the fix (essentially the revert of a patch that impose erroneusly limits to the pointer to avoid loss of windows.
It is applied as last patch in the quilt series file. ** Patch added: "unconstrain-cursor-harder.patch" https://bugs.launchpad.net/ubuntu/+source/xorg-lts-quantal/+bug/1202711/+attachment/3745147/+files/unconstrain-cursor-harder.patch -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-lts-quantal in Ubuntu. https://bugs.launchpad.net/bugs/1202711 Title: xrandr --scale --rotate command affects display but not pointer boundaries To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-lts-quantal/+bug/1202711/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp