RK3399 HDMI output and USB 3.0 not working with Linux 6.1

Troubleshooting
74

Regarding the HDMI issue: I have a NanoPi NEO4 and a NanoPi M4v2 where also the HDMI output did not work.

I came across this page: How to enable HDMI on in U-Boot on OrangePi4, rk3399? - Rockchip - Armbian Community Forums

What at my NanoPis helped was:

  • Manually edit the /boot/dietpiEnv.txt via nano /boot/dietpiEnv.txt
  • I located a line with extraargs at my file which was
    extraargs=net.ifnames=0
  • In this line I added video=HDMI-A-1:1280x720@50, so the line then was
    extraargs=net.ifnames=0 video=HDMI-A-1:1280x720@50
  • reboot

Remark: Changing the resolution via dietpi-config is a bit tricky, because dietpi-config does not know the necessary entries and also does not always set the refresh rate (→ @50 for 50 Hz). If you “play” with these settings indietpi-config, it is a good idea to check the file /boot/dietpiEnv.txt afterwards.

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