Can't not enable 4k 60HZ in raspberry pi 4

ARM Technical Assistance
1

Does anyone have successfully enabled 4k 60HZ in manjaro arm xfce 20.08? Thanks

I am using the official micro hdmi cable and power supply. So can eliminate hardware problems.

2

Make sure that you are running only 1 monitor and the cable is in the HDMI port closest to the power plug.

That should give you a desktop in 4K60Hz.

3

Strit, Thanks first.
I only connected my raspberry pi 4 to my AOC monitor which can output 4k 60HZ in Win10 and this HDMI port closest to the power plug.

I can see the 4k 60HZ in display dialog box. But when I chose it and click apply then my monitor show “no signal”

I had added “hdmi_enable_4kp60=1” to /boot/config.txt.

4

Is your HDMI cable compatible with HDMI specification version 2.0 or above?

5

Yes. I double checked and my cable is official micro hdmi cable.

I think I can not see 4k 60HZ in display dialog box if my cable not compatible with HDMI specification version 2.0 .

Thanks Feakster.

6

Seems like some one else could only get theirs working only in fbturbo mode (default in raspian). We have our images configured for mesa 3d rendering.

Try installing xf86-video-fbturbo-git from the repo
Change gpu_mem to 512 in config.txt
leave hdmi_enable_4kp60=1 as is
Reboot and see what it does

7

Darksky, thanks for you help first.

I did it once as you said and it showed no signal after reboot. Below is my config.txt content

initramfs initramfs-linux.img followkernel
kernel=kernel8.img
arm_64bit=1
enable_gic=1
disable_overscan=1

#enable sound
dtparam=audio=on
hdmi_drive=2

#enable vc4
dtoverlay=vc4-fkms-v3d
max_framebuffers=2
over_voltage=6
arm_freq=2000
gpu_freq=750
gpu_mem=512
hdmi_enable_4kp60=1

8

Try this config:

initramfs initramfs-linux.img followkernel
kernel=kernel8.img
arm_64bit=1
enable_gic=1
disable_overscan=1

#enable sound
dtparam=audio=on
hdmi_drive=2

#enable vc4
dtoverlay=vc4-fkms-v3d
max_framebuffers=2
over_voltage=5          # 6 voids your warranty
arm_freq=2000
# gpu_freq=750
gpu_mem=512
hdmi_enable_4kp60:0=1
hdmi_mode:0=97
hdmi_group:0=1
hdmi_force_mode:0=1
hdmi_ignore_edid:0=0xa5000080
9

Hi Darksky,

I used the configuration you provided. After loading, a black screen was displayed, and the login interface was not displayed. But I can ssh link to my Raspberry Pi 4.

Thanks again.

10

Try rem out these 2 lines and reboot. Other than this I am out of ideas.

#dtoverlay=vc4-fkms-v3d
#max_framebuffers=2
11

Had this problem in July without solution. Driver seems to be broken.
See my own thread: archived.forum.manjaro DOT org/t/4k-60-hz-on-raspi4/152723