I am trying to:
- use a Thinkpad L590 running Ubuntu 20.04
- connected to a Thinkpad Hybrid USB-C USB-A dock
- to display to an external monitor connected by HDMI to the dock
I cannot get it to work (the screen detects no signal). Of course if I connect the screen directly to the laptop it works.
I tried to disable secure boot as some discussions suggested that online, with no effect.
Any idea?
Edit 1:
If I plug in the screen (which has a USB-C output) directly to the USB-C of the laptop, it works too. The problem is to get it to work through the USB-C of the dock, so that I have only 1 cable going from the laptop to the dock.
Edit 2:
The Thinkpad L590 belongs to the series L and, therefore, it has only USB C, no thunderbolt. Can this be the explanation?