Hi, I polished a bit around the xrandr command you mentioned:

if [ -f /proc/acpi/ibm/video ]; then
        state=$(awk '/lcd:/ {print $2}' /proc/acpi/ibm/video)
        if [ "$state" = "disabled" ]; then
                /usr/bin/xrandr --output LVDS1 --off --output VGA1 --preferred
        fi
fi

This way it looks to be a valid work around for this issue. The external
display comes up with it's native resolution while the internal is
disabled. But everytime a gdm update comes out I have to check if there
is any change in /etc/gdm/Init/Default. That is the bad side of this
solution...

-- 
x61: Clonemode active while in docking station with closed lid
https://bugs.launchpad.net/bugs/564463
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