Ubuntu
linux package

  1. Bug #1555078
  2. Comment #19

Comment 19 for bug 1555078

Revision history for this message
Robert Schetterer (rschetterer) wrote :

Update: Due a lot of testing, my best speculate is, that the Thinkpad pro dock 90 w acts as MST-DP Hub ( Display Port 1.2 Hub )
After Docking the Kernel renames DP Ports, this is needed in use with real DP 1.2 Displays. But from then ( docked in ) the resume code in DRM is not longer working ( it works if the displays are attached directly to the laptop ).
So the resume bug should be somewhere in the Intel DRM / MST-DP code.

After all i found some easy workaround ( not with xrandr, cause it dont works with more the one external display )
and updated
https://sys4.de/de/blog/2016/03/09/external-displays-thinkpad-pro-dock-90w-stay-switched-after-resume/