Thanks. It looks like an Intel-graphics-only system. So if the extra display doesn't show up in xrandr, can you please run this command to see if it's showing up in the kernel?
grep . /sys/class/drm/*/enabled grep . /sys/class/drm/*/status grep . /sys/class/drm/*/dpms
Ideally both with and without the dock connected.
Thanks. It looks like an Intel-graphics-only system. So if the extra display doesn't show up in xrandr, can you please run this command to see if it's showing up in the kernel?
grep . /sys/class/ drm/*/enabled drm/*/status drm/*/dpms
grep . /sys/class/
grep . /sys/class/
Ideally both with and without the dock connected.