- Lenovo laptop (T580) with Intel Corporation UHD Graphics 620 (rev 07)
- LENOVO ThinkPad Ultra Dock (docking station)
- 2x Dell UltraSharp 27 4K monitors (U2720Q)
Connecting a single monitor to the docking station at a time works just fine. Verified with both monitors and both DisplayPort connectors.
When I connect both monitors at the same time the Settings application i Gnome detects both correctly, but I am only able to get a picture on one, the other always stays black (not always the same though). Disabling the “built-in” monitor in the laptop changes nothing - one external monitor stays black.
Attaching both monitors directly to the laptop using USB-C actually allows me to use all three monitors (highest resolution) simultaneously without any problems.
I’ve also tried to attach the monitors to the 2x USB-C connectors in the docking station which does NOT work. The Settings application doesn’t even register the monitors, even though I do see some usb related stuff happening in
How can I debug this (presumably docking station problem) further. I would prefer to make the monitors work with the docking station, but the second best thing is to be able to make a usable bug report.