I have to add that the whole resolution setting process I described above became so complicated with ubuntu 14.04 that I have to execute these commands a few times until this works.
Sometimes it seem to setup an even smaller resolution while the mouse cursor is setup for another resolution. So you can't use the mouse while the rendering of the mouse cursor doesn't match to the real position of the cursor.
I have to add that the whole resolution setting process I described above became so complicated with ubuntu 14.04 that I have to execute these commands a few times until this works.
Sometimes it seem to setup an even smaller resolution while the mouse cursor is setup for another resolution. So you can't use the mouse while the rendering of the mouse cursor doesn't match to the real position of the cursor.