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

Reply via email to