Troubles using DP Alt Mode portable screen

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Hi everyone,

Day after day, I get all I want working in NixOS. The only thing that is still “broken” is my external portable monitor which uses DP alt Mode (not Displaylink). When connecting it, it is powered on, but no video signal is being sent to it, and I don’t see it in Hyprland using hyprctl monitors.

My current config: GitHub - clementpoiret/nixos-config: :snowflake: NixOs / Hyprland rice with Home-Manager :snowflake:

I only tried with my AMD dGPU on (Framework 16), both on usual usb-c ports and the usb-c port on the dGPU.

Here is what I get in dmesg, which are messages introduced by the 6.9 kernel from what I understand by googling those errors:

[  355.424475] ucsi_acpi USBC000:00: GET_CABLE_PROPERTY failed (-5)
[  355.841433] ucsi_acpi USBC000:00: unknown error 0
[  355.841451] ucsi_acpi USBC000:00: UCSI_GET_PDOS failed (-5)

I tried on all of my 7 usb-c ports, the cable is the one coming with the portable screen, and everything worked well on my previous laptop.
Do you have any clue about the issue?

Thanks a lot!

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