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
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