Ubuntu image with X11 and Resolution 2560x1440

#3

Not sure if same setup as op, I used ubuntu server image and then installed ubuntu-desktop and I’m able to get 4k60hz on HDMI1.
Unfortunately I am unable to get 4k120hz on same port. Switching to 120hz loses video and then will revert to 60hz.

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#4

Thanks, is it the 5:10 kernel or does the desktop install update the kernel? I’ll give it another try.

#5

rock@rock-5b:~$ uname -a
Linux rock-5b 5.10.66-27-rockchip-gea60d388902d #rockchip SMP Mon Oct 24 08:25:47 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux

#6

I have to use this device tree overlay to enable my Philips 4K monitor: https://github.com/amazingfate/radxa-rock5b-overlays/blob/main/rk3588-add-hdptxphy_hdmi_clk.dts.

#7

I think only one port can provide 120fps at 4k

#8

I found a solution:

I got https://raw.githubusercontent.com/amazingfate/radxa-rock5b-overlays/main/rk3588-add-hdptxphy_hdmi_clk.dts

compile the dts file
dtc -O dtb -o rk3588-add-hdptxphy_hdmi_clk.dtbo rk3588-add-hdptxphy_hdmi_clk.dts

and install it into your current kernel dtbs directory:
cp rk3588-add-hdptxphy_hdmi_clk.dtbo /boot/dtbs/uname -r/rockchip/overlay/

sudo vim /boot/extlinux/extlinux.conf

and replace /dtbs/5.10.66-27-rockchip-gea60d388902d/rockchip/overlay/rock-5b-hdmi1-8k.dtbo with /dtbs/5.10.66-27-rockchip-gea60d388902d/rockchip/overlay/rk3588-add-hdptxphy_hdmi_clk.dtbo

use uname -r to get your current kernel release string and replace it accordingly.

reboot and then change the resolution in you running X11 session.

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HDMI display output issue
2K HDMI monitor cannot be recognized
#9

My ultra wide monitor worked perfectly with my rock 5B. I use just one type-c cable to get 5b powered up and runs at 3440*1440 165Hz. By the way, I’m using the official debian image.

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#10

To be clear, your in display port alt-mode and the usb-c cable is providing both power to the 5b and video out to the monitor, correct?

#11

Exactly…

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#12

Tested on the official Debian image

I managed to get 2560x1440@60 on my monitor (native res) through USB-C (through a hub with HDMI output), but not able to get more than 1080p60 from the board’s own HDMI output.

#13

Can you try out my Solution (Ubuntu image with X11 and Resolution 2560x1440)?

Try it without build a new Kernel.

#14

Thank you!
It’s working fine with 2560x1440 at 100 Hz @HDMI1 without a new kernel.

I didn’t have a rock-5b-hdmi1-8k.dtbo line and only added the line to the fdtoverlay-line in the extlinux.conf (I am using the Debian-Image, not Ubuntu - maybe that’s the difference)

I had to install the dtc-package, before i could compile the dtb:

sudo apt-get install device-tree-compiler

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#15

Hi n0x,

Roschach seemingly had a successful result, but on the contrary my main display capable of native 3440x1440 @ 75Hz was not totally usable out-of-the-box on the Debian X11 bullseye image, and only 1600x1200 was available.

But your suggested method, without kernel rebuild, worked fine for me too.

Thanks for your contributions

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#16

Actually I had exactly the same problem, and as you I was success just I was a bit confused with the /boot/extlinux/extlinux.conf but as you said I just set:

fdtoverlays /dtbs/5.10.66-27-rockchip-gea60d388902d/rockchip/overlay/rk3588-add-hdptxphy_hdmi_clk.dtbo

and also took 2560x1440 60Hz in both HDMIs :slight_smile:

thanks

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#17

I can confirm that this also works for my 1920x1200 display on armbian, I used user_overlays as described here: https://docs.armbian.com/User-Guide_Allwinner_overlays/
otherwise a new kernel package will overwrite it.

#18

I built the `rk3588-add-hdptxphy_hdmi_clk.dtbo and cp’ed it to kernel dtbo location and edited armbianEnv.txt. I also set the perms same as other dtbo’s. (no extlinux on Armbian). Any help to get 1440p res pls. I tried the user_overlays way also.

#19

Can you be so kind to provide some additional info on how you got this to work on Armbian?

It is in armbianEnv.txt you are editing?
Can you make a step by step?

#20
  • create a folder /boot/overlay-user/
  • copy the dtbo file there
  • create line: user_overlays=rk3588-add-hdptxphy_hdmi_clk in armbianEnv.txt

note I I just wrote it from the top of my head, as I had to RMA my board.
The confusing thing here is the inconsistent nomenclature: overlay-user != user_overlays

#21

TY sydarn2. It worked. :slight_smile:

#22

Did not work for me :cry:

I’ve never compiled file before.

I simply copy the text in…:
https://raw.githubusercontent.com/amazingfate/radxa-rock5b-overlays/main/rk3588-add-hdptxphy_hdmi_clk.dts

…from browser and paste in notepad, saving as .dts file. Then compile the dts file I created.

Not correct way maybe?