USB-C video output used to work fine with an USB-C to HDMI adapter, but it stopped working since 5.10.110-27-rockchip.
The feature is also broken with the last kernel, i.e. 5.10.110-29-rockchip.
Directly using HDMI is working fine.
I selected 5.10.110-26-rockchip in /boot/extlinux/extlinux.conf and the USB-C video out works again.
USB-C video output used to work fine with an USB-C to HDMI adapter, but it stopped working since 5.10.110-27-rockchip. The feature is also broken with the last kernel, i.e. 5.10.110-29-rockchip. Directly using HDMI is working fine.
I selected 5.10.110-26-rockchip in /boot/extlinux/extlinux.conf and the USB-C video out works again.
I uploaded the last dmesg. https://gist.github.com/elpatax/c2774f54b133e466410117a1e58fd97d