** Summary changed:
- UI login invisible / UI hanging when Dual 4K monitor via Displayport MST is
connected (Lenovo Ultra Dock)
+ Login screen invisible / UI hanging when both 4K monitors connected via
Displayport MST (docking station)
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Update:
I did a full 17.10 reinstall as last attempt.
I can confirm the following symptoms:
- When both 4k displays are connected to the docking (displayport MST), UI
login screen is already hanging (see earlier screenshot)
- When 1 x 4K display is connected it works. When connecting 2nd display
** Tags added: displayport multimonitor
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https://bugs.launchpad.net/bugs/1725455
Title:
Dual 4K monitor via Displayport MST not working (Lenovo Ultra Dock)
To manage notifications
Public bug reported:
I am experiencing serious issues after upgrading to Ubuntu 17.10 (coming
from 17.04 with Gnome, kernel 4.13).
I have 2 x 4K (Asus PB279Q) monitors, connected to a Lenovo Ultra Dock
(containing 2 x Displayport via MST), where the Lenovo T550 is
connected onto it. Both monito
Hi
Working for 2 days now on Ubuntu 17.04, updated to your proposed kernel
4.11.0-994
Amazing... working dual 4K now via 2x displayport 1.2 without a glitch on both
monitors for the first time.
Fantastic! And indeed, I hope too, that these fixes will be included a.s.a.p.
I was almost desperate
After a long search for many many weeks/months, I have found this post.
I own a Lenovo T550 and tried different versions of Ubuntu's, to connect
to my 2 external Asus PB279Q (4K) via Displayport (1.2). Tried as well
via the docking-station and the DP in the laptop itself (connecting both
gives me
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