HDMI doesn't work for rk3568 on some displays

[kostprof21]

I am using kernel 6.12.45 with rk3568 , everything is displayed on my monitor. A colleague's computer does not work on 3 of the 4 monitors. the error is the same as in the theme

/

kernel: rockchip-drm display-subsystem: [drm] Cannot find any crtc or sizes

, since it seems that no one is watching that topic, I decided to raise this issue. Has anyone encountered such a problem?

[Werner]

Radxa Zero has a different soc: https://radxa.com/products/zeros/zero/

Double-check what hw you actually have

[Werner]

Providing logs with 

armbianmonitor -u

 helps with troubleshooting and significantly raises chances that issue gets addressed.

[kostprof21]

Hi Werner
I apologize for radxa zero, as I do not know which tag to choose. I have a board based on OK3568 from Forlinx.
Logs https://paste.armbian.com/ohokuhozab

[Werner]

tag adjusted

[The Tall Man]

The board I have has a different Rockchip SoC (rk3588-orangepi-5-plus), but it's been my experience that the edge kernel (6.16) is the only one that's of any real use to me. I get no video with the "current" (6.12) kernel, and no GPU acceleration with the vendor (6.1) kernel.

 

So I would suggest just switching to the edge kernel.

[Werner]

3 hours ago, The Tall Man said:

I get no video with the "current" (6.12) kernel,

Expected. current had a bare minimum of hdmi support before it became recent LTS kernel. Therefore no fixes will hit there until rollover to next LTS.

3 hours ago, The Tall Man said:

and no GPU acceleration with the vendor (6.1) kernel.

Needs to be enabled. Either enable panthor overlay (the mainline panthor driver was backported to vendor kernel but is disabled by default) and install more recent mesa packages (depends on userspace). Or install proprietary mali blobs.

Having or building an image with mesa-vpu extension enabled handles that for you. There is no automatic method of installing afterwards yet. https://github.com/armbian/apa/issues/20

[kostprof21]

I tried it on 6.16.7, and the log started working:

[    4.838111] rockchip-drm display-subsystem: [drm] fb0: rockchipdrmfb frame buffer device

Error again after initialization:

[    5.118148] rockchip-drm display-subsystem: [drm] Cannot find any crtc or sizes

[    5.637839] rockchip-drm display-subsystem: [drm] Cannot find any crtc or sizes

 

[kostprof21]

I switch to vendor kernel 6.1.115 - its work

[The Tall Man]

On 9/12/2025 at 3:51 AM, Werner said:

Needs to be enabled. Either enable panthor overlay (the mainline panthor driver was backported to vendor kernel but is disabled by default)

@Werner, I merged the Panthor overlay with the Vendor devicetree using the fdtoverlay command (since I'm using efi/grub instead of u-boot), and now Vendor kernel with GPU is an option!! Thank you so much!!

https://forum.armbian.com/topic/55266-add-devicetree-to-grub-automatically-heres-how/#findComment-226070

 

Question:

I've noticed (at least in Debian on the Orange PI 5 Plus) that the Vendor kernel (with Panthor GPU overlay) works well under X and Wayland, but the Edge kernel only works well under Wayland. With the Edge kernel under X, the GPU is "there", but it doesn't seem to offer any kind of acceleration. I noticed this the first time I tried the Edge kernel several months ago, and it's still the case. Do you know of a fix for this as well?

Edited 1 hour ago by The Tall Man