D6000 Issues
 

I am having the exact same issue. HDMI is the only port that looks to work on my recently purchased D6000. I can connect my XPS13 directly to a U4919DW via USB-C without issue, confirming the D6000 is the problem.

D6000 dock station - HDMI works, DPs no. Ethernet no.
 

Latitude 5500, D6000. This morning I came into work-- I have the same problem with D6000 dock station - HDMI connection works fine, but not DP, but it did work for ~3 months, then stopped working today. For me the Ethernet stopped working from the D6000 too.
When I switched in another D6000, everything worked. So the Dock must be the problem.
Updated D6000 to latest software, updated drivers, checked cabling, etc. no luck.
Maybe the D6000 needs replacement? I can't understand what would have caused it to stop working...

Hello Kuthu, whocares, denis.schlesinger and Andrew Sporaw,

From analysis, it looks like the monitors you are using were too far out of the spec to have the DisplayPort link train properly.

We believe we have found a way to make these display work without breaking the other millions users.
We are preparing a development build before a formal release.
Would anyone of you be interested in getting that development build privately as soon as it becomes available?

I will move other comments into a different thread as they don't seem relevant to the original poster report.

Kind regards,
Alban
Ref 30667

Hello, AlbanRampon.
Thanks for the answer, i'm interested in testing this development build. Just say what i need to do (here or pm).

Hi, AlbanRampon.
I am also interested in testing this development build.

Hello,
[...EDIT...]
The workaround for these displays was delivered in v9.3 early December.

EDIT: please use the latest driver available.

Kind regards,
Alban

2AlbanRampon
Done. Many thanks for help.