Setup: Lenovo ThinkPad T540p, docking station, NEC monitor attached to docking station.
Intel driver version: 2.99.906
xorg-x11-server version: 7.6_188.8.131.521.
When updated kernel from 3.16.3 to 3.17 - X cannot start when monitor is attached to docking station, but works fine when not attached.
Following upgrade fixed the issue:
Intel driver version: 2.99.916
xorg-x11-server version: 7.6_1.16.1
Additional info attached to mailing list:
MST breaks old Xservers which fail to fallover gracefully. *shrug*
I think Dave said we should wontfix this one. Dave please re-open if not; I think you may have had a patch to handle things.