Manjaro Arm has been working pretty well for me so far on my Pinebook Pro. I installed in January without X, opting for Wayland and Sway. In April, my System stopped getting updates, so I was stuck on linux-pinebookpro-56 iirc. Two days ago, I changed the Mirrors to the correct ones and updated everything at once.
This worked kinda fine, except that now, on linux-58 mainline, USB-C DP-Altmode with my USB-C to HDMI adapter has stopped working.
When I use Sway on Wayland,
swaymsg -t get_outputs only shows the internal Display adapter eDP-1. On Gnome with X,
xrandr also shows DP-1, but always lists it as “Disconnected”.
It definitely is not a hardware fault, booting Kali Linux from an SD-card worked fine with an external display.
dmesg -w only shows the USB-Billboard-device being recognized and one other line:
cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work [rockchipdrm]] Not connected. Disabling cdn
Does anyone have a clue what I could do to fix this behaviour? I don’t know whether the Kernel is at fault here, because linux 5.7.1 from Kali Linux worked fine and theoretically, this issue with the DP-Altmode not working should have been resolved, according to this discussion.
It would be really great to find a workaround of some kind, because I am kind of dependent on using an external monitor for my work.
This seems to be a known problem, as mentioned in this thread.
I guess I will see whether I can downgrade my kernel to linux 5.7