# RK3399 HDMI output and USB 3.0 not working with Linux 6.1

**URL:** https://dietpi.com/forum/t/rk3399-hdmi-output-and-usb-3-0-not-working-with-linux-6-1/17776
**Category:** Troubleshooting
**Created:** [29 August 2023 17:31 UTC](https://dietpi.com/forum/t/rk3399-hdmi-output-and-usb-3-0-not-working-with-linux-6-1/17776 "2023-08-29T17:31:33Z")
**Posts on this page:** 1
**Showing post:** 74

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### Author: ![StephanStS](https://dietpi.com/forum/user_avatar/dietpi.com/stephansts/32/2522_2.png) [@StephanStS](https://dietpi.com/forum/u/StephanStS)
#### Post date: [14 August 2025 20:32 UTC](https://dietpi.com/forum/t/rk3399-hdmi-output-and-usb-3-0-not-working-with-linux-6-1/17776/74 "2025-08-14T20:32:46Z")

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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](https://forum.armbian.com/topic/16520-how-to-enable-hdmi-on-in-u-boot-on-orangepi4-rk3399/)

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 in`dietpi-config`, it is a good idea to check the file `/boot/dietpiEnv.txt` afterwards.

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