Problem solved. I changed the rdesktop script in screen.d and added this line (commenting out the original) /usr/bin/xinit /opt/ltsp/i386/usr/bin/rdesktop.1024x768 This is the contents of /opt/ltsp/i386/usr/bin/rdesktop.1024x768 /usr/bin/xrandr -s 1024x768; /usr/bin/rdesktop <a href="http://192.168.0.13">192.168.0.13</a> -f -u "" -d domain; So I guess xrandr might be the solution going forward. We could use -q to check for the possible resolutions and use -s to set the one to use.