I just found out an interesting thing. The displays are indeed detected,
but are not added by xorg, instead they are removed.
This is a log from undocking:
[ 840.894] removing GPU device
/sys/devices/pci:00/:00:02.0/drm/card0/card0-DP-5 (null)
[ 840.897] (II) intel(0): EDID vendor
Package: xserver-xorg
Version: 1:7.7+7
Severity: normal
Dear Maintainer(s),
* What led up to the situation?
I installed the 3.17-rc5 linux kernel from experimental in order to use
multiple screens with my new Ultradock for my Thinkpad X240 since it
brings the DisplayPort Multi-Stream Transport
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