Continued the battle for additional 1.5 hours.
I verified that both displays work fine when connected directly to the laptop
(1 DP) without the HP ultraslim docking station (2 DPs) between.
After powering off the docking station and rebooting the system for Nth
time, I finally got the pictures
Public bug reported:
My two external displayport connected displays worked fine until last thursday.
After bringing my laptop to the same HP dock station three days later, they
stayed blank no matter what.
Displays are seen by X (other of them was powered off during the bug report)
and
I had this same problem, and managed to pass through it by furiously closing
down those error windows manually during the upgrade process. It kept popping
new ones up at least 50 times, and continued then normally.
When all the packages were upgraded, it finally popped up an error saying that
Public bug reported:
These DRM warnings started to appear on dmesg after moving from Ubuntu
14.04 LTS to 15.10. I can't notice anything on X usage when the messages
appear, but the system has recently freezed twice when shutting down a
VM running on Vmware workstation 11.1.3. That's why I started
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