How to enable 4k/60hz on RPi4

Quote from Zygmunt

Hello everybody
I couldn't leave this problem unsolved, so I returned to this thread to check for new info.
Hiassoft, you inspired me to further investigation writing: "Did you enable "Ultra HD Deep Colour" in your TV's HDMI port settings? If not then the PC will likely use 4:2:0 to output 4kp60 and RPi4 will be limited to 4kp30 as it doesn't support 4:2:0."
I couldn’t find "Ultra HD Deep Colour" in my Hisense 43A65H settings, but I checked display info on my PC (Intel N5105) and found that output is 2160p/60 YCbCr420. I couldn't find any info about color depth output from N5105.

I connected PC to LG 32UL500-W, which has a maximum refresh rate of 60Hz on HDMI input. (HDMI 2.0). The max I could get was 2160p/60 YCbCr420.
Where is a limit? In PC or LG monitor?
Than I connected PC to Denon X7200WA (connected to old 6040UB projector) and got 2160p/60 YCbCr420. I didn't expect any better result because 6040UB doesn't accept signals over 2160p/60 YCbCr420.

Now it is time for RPi4 and RPi5
RPi4.
I added "hdmi_enable_4kp60=1" to config.txt just after hdmi_ignore_cec_init=1
After connecting to Hisense 43A65H, RPi4 didn't let me go over 30Hz.
So there are questions:
Does Hisense 43A65H really accept 2160/60 4:4:4 and 4:2:2? It does not. (Or there is EDID problem).

Connected to LG 32UL500-W. RPi4 let me set 60Hz. It means that "hdmi_enable_4kp60=1" works, Hisense 43A65H has a problem with RPi and my PC can not send 2160/60 4:2:2 only 4:2:0.
After connecting to Denon with projector OFF and only LG monitor connected, I could set RPi4 to 60Hz as well. It means that LG 32UL500-W accepts 4:2:2.

Now RPi5
After connecting to Hisense 43A65H, RPi5 didn't let me go over 30Hz exactly like RPi4.
When connected to LG 32UL500-W, RPi5 let me go to 60Hz without a problem.
I connected RPi5 to Denon/LG monitor. No picture at all. I replaced RPi5 by RPi4 - and there is a picture. I connected RPi5 - no picture. Weird. Why RPi4 works but RPi5 doesn't?

In next step I was testing RPi4 and RPi5 connected directly to LG monitor. I could play my 2160p/60 fps videos H.265 smoothly, but 2160p/60 fps H.264 videos are choppy on both players.

Last test - 1080p movies. Both players play 1080p H264 without a problem.
RPi4 has a problem with 1080p VC-1, but RPi5 plays them smoothly.

Thank you all of you for your help.

Display More

Sounds like your HiSense only accepts 4:2:0 connections for 2160p50 and above - and not 4:2:2, but your LG accepts 4:2:2 at 2160p50 and above.

The Pi 4 and Pi 5 don't output 2160p50 and above in 4:2:0 (the Pi doesn't support 4:2:0) so that explains no 2160p60 on your HiSense from the Pi, but the LG being OK with 4:2:2 from the Pi 4/5 at 2160p60.

WRT to your Denon AVR - there are known issues between Pi5 and Pi5 and some Denon AVRs.

Zygmunt,

only a curious question regarding the VC-1 performance at your RPi4: Do you have additional lines in config.txt like this?:
enable_uart=1

Quote from Zygmunt

After connecting to Hisense 43A65H, RPi5 didn't let me go over 30Hz exactly like RPi4.

Quote from Zygmunt

I connected RPi5 to Denon/LG monitor. No picture at all.

You make debugging more complicated than necessary. Try without AVR's. If the issue persists, provide a log.

Two other things I'd mention :

1. For 2160p50 4:2:2 you need an 18Gbs HDMI 2.0-compatible cable - I ensure mine have the HDMI Premium Certified hologram (they aren't expensive). Cables that work with 2160p60 4:2:0 (which is HDMI 1.4 bandwidth) often fall over at 2160p60 4:2:2.

2. Argon cases with HDMI extenders (little PCBs internally that have MicroHDMI plugs and Micro or Full-size HDMI sockets) to bring the HDMI ports out to the rear of the case are notoriously bad quality - they don't work reliably with 18Gbs HDMI 2.0 signals.

I asked this because I had stumbled upon this information::

https://www.raspberrypi.com/documentation/computers/configuration.html#mini-uart-and-cpu-core-frequency

But it seems, that the described behavior regarding the reduced/fixed core clock is not true in all cases and because of some open bugs in the firmware is not predictable.

enable_uart=1 NOT fixing core_freq to 250MHz · Issue #4123 · raspberrypi/linux

Is this the right place for my bug report? I hope so, apologies if that's not the case. I've also posted on the RPi forum (See…

github.com

I understood that VC-1 is not hardware decoded with a RPi4. But at a desktop computer ffmpeg tries to use some common acceleration functions to decode newer formats, which not directly supported by the GPU. It could be wrong, but my idea was, you should check if the VPU of the RPi4 has switched to 500 or 550MHz, to ensure that you get the maximum performance and not work against an additional limit.

vcgencmd measure_clock core

Please test with LE12, it contains VC-1 playback optimizations and lots (but not all) VC-1 files should play fine on RPi4.

so long,

Hias

Quote from Zygmunt

I did. I wrote about it. I found that there is communication problem between my DenonAVRX7200WA and RPi5.

When I go to Denon and press "info", suddenly I have a picture from RPi5 and it stays until I turn RPi5 OFF. I can switch AVR to other inputs and after returning to RPi5, picture is still ON.

You've tried different hardware setups. Maybe your RPi's have wrong EDID data stored now.

To adjust it, type this on SSH (assuming you have a working setup, as you managed to get above)...

1. getedid delete
2. getedid create
3. reboot

I have an rpi4 and a Panasonic oled 4k TV. I configured libreelec following your advice and I got the display 2160/60Hz. The next day the 60Hz had disappeared, only the 30Hz was available. This happened. several times the 2160/Hz60 does not remain permanently available. However, I do not change anything in the configuration. excuse my English I'm French.

calmos Are you using 4K60 'certified' cables and a 5V/3A (or better) PSU?. If it can work the config is done correctly on the RPi4, but you need to have an HDMI cable that will support higher bandwidth and a decent PSU.

Get a 8K cable. I like UGreen.

problem solved oddly. I start rpi4 libreelec 12.0, 30Hz only available. I restart rpi4 and 60Hz is available. I specify that my cable is ok. I'm happy with this solution.