according to this other thread:
the USB C port on the Librem Mini does not support display over HDMI. I am having the same problem on my MiniV2. Is there any way to get more than 2 monitors (one on DP, one on HDMI) on the MiniV2?
Possibly relevant:
Currently, I have one monitor connected to HDMI, and one to DP, and xrandr shows virtual monitors DP-1 and DP-2 as “connected” while (virtual) monitors DP-3, HDMI-1, and HDMI-2 are “disconnected”.
If you have a screen that can do DP daisy chaining you can add a second DP screen after that.
Cheers
nicole
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This did work for me. Thanks