Very good catch. Indeed, the problem is that the external TV device is detected as always being attached. This causes gdm, gnome, etc to use the smaller of the "two: screens.
Disabling the TV output with `xrandr --output TV --off` "solves" the problem. In order to prevent external TV output to be activated at boot time, the following is necessary to /etc/X11/xorg.conf: Section "Device" Driver "intel" Option "monitor-TV" "TV" EndSection Section "Monitor" Identifier "TV" Option "Ignore" "true" EndSection This hint was taken from http://www.intellinuxgraphics.org/dualhead.html I'd suggest that we make that entry above the default in our xorg.conf, Alternatively, we can perhaps change the xserver-intel driver to not enable the output TV, even presence of a monitor is detected. -- not using whole widescreen https://bugs.launchpad.net/bugs/136783 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs