storz Posted January 6, 2024 Posted January 6, 2024 does displayport over usb-c dock work for you? It doesn't for me neither on 5.15 nor on 6.1. 0 Quote
Florian Haas Posted yesterday at 02:08 PM Posted yesterday at 02:08 PM Hello storz, I wonder if you ever managed to get this to work. I used to have this working, but not anymore, and I wonder if I can make it work again. I have an Anker A8312 USB-C to HDMI adapter (which, like all similar adapters, really does DisplayPort in Alt mode over USB-C, and from there converts to HDMI). I previously used this on my PBP with Armbian Focal, and it worked fine just so long as I ran GNOME on X.org, as opposed to Wayland. I was able to connect an external monitor via an HDMI cable, it showed up in the GNOME display settings, and I was able to use it as one would expect. I unfortunately have a hard time finding out the exact kernel version I used at the time, but I believe it was a 4.9 rockchip kernel. I recently reinstalled my PBP using Armbian Noble and apparently there's a kernel regression that causes the adapter to not be recognised anymore. On a 6.1 kernel (which is what shipped with Armbian Noble as it came out), the device is not recognised at all. On a 6.12 kernel (currently available via updates, at the time of writing), the device does show up in lsusb, but only as a "billboard device" which means that the device wasn't correctly switched into DP Alt mode and is thus unusable for connecting a screen. I am still on GNOME on X.org, I still use the same adapter, and I still connect to the same monitor with the same cable as before. So with all other variables being identical, I do strongly suspect this to be a kernel or perhaps a firmware issue. Perhaps you (or someone else) have any pointers that might help me move towards getting this working again. I'd be most grateful for those. Thanks! Cheers, Florian 0 Quote
Michael Robinson Posted yesterday at 03:40 PM Posted yesterday at 03:40 PM posting output of : armbianmonitor -u Helps with support. 0 Quote
hexdump Posted 1 hour ago Posted 1 hour ago not sure what the current state of this is, but i think megi always had a hack to make it working in their trees - maybe just try to apply the corresponding patch from the last commits of https://codeberg.org/megi/linux/commits/branch/pbp-6.18 to your kernel build and see if it works? good luck and best wishes - hexdump 0 Quote
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