Hi, Your bug is quite old, sorry for the delay. Could you please provide your /etc/X11/xorg.conf ? You should have something like that in it, with the size of both screen in Virtual : SubSection "Display" Viewport 0 0 Virtual 2800 2800 Depth 24 EndSubSection If this is not or badly defined, you will probably not be able to use the full resolution of your screens. Regards, Adrien