Suddenly, my Raspberry Pi 4 can't display video when both HDMI ports are in use

Hi community!

After achieving the use of one HDMI for video and the other for audio with the Raspberry Pi 4B, I used it for a couple of days without any issues.

However, now when I turn on my Raspberry Pi and both HDMI cables are connected, I can't get video, or I have it for only 1 second when the color palette appears.
After that, I can't see the boot process, but I know that it boots correctly because I can manage Kodi from the Kore app to turn it off correctly.

I have to unplug the HDMI cable used for audio and turn on the Raspberry Pi to get video.
Even if the home theater is turned off, just with the HDMI plugged into the Raspberry Pi, I can't get video.

I initially thought that it was related to the power supply I was using (5V 3.1A), so I bought a better one (5V 4A), but the issue persists.

Is this a configuration issue or a hardware issue? How can I fix it?

Thanks in advance.

Reddirt check my previous thread:

Thread

Can I use one HDMI output of the Raspberry Pi 4B for video and the other HDMI output for audio?

Hi community!

My setup is:
Raspberry Pi 4B (4K)
LG OLED BX (4K, Dolby Digital, Dolby Atmos)
Yamaha HTR-3064 AV Receiver (1080p, Dolby Digital, Dolby Surround, Dolby TrueHD, DTS Digital Surround, DTS Express, DTS-HD High Resolution Audio, DTS-HD Master Audio, etc)

Currently the Raspberry Pi 4B is connected with my TV via HDMI.

I understand that if I use TV's e-ARC, it will send only Dolby Digital to Yamaha AV Receiver.
If I connect the Raspberry Pi 4B to Yamaha AV Receiver it will send 1080p video to…

EloyFarina

February 4, 2024 at 7:09 AM

After hours of testings, I've noticed that if the HDMI cable is not connected to the AVR, Raspberry display image, but if I connect the HDMI to the AVR, even if the AVR is not plugged to the wall socket there is no image.

Something that I didn't mentioned before is that now I'm using HDMI adapters or extensions for the HDMI used to pull audio.

Is that a root cause of the issue? Should I buy a micro HDMI to HDMI 3 or 5 mts. cable?

I've tested with and micro HDMI adapter to HDMI and a HDMI cable 3 mts but didn't work.

I've tested with an micro HDMI to HDMI 1.5 mts cable but it was to short so I used an extensor adapter HDMI and then an HDMI 1.5 mts cable, but didn't work.

I've put the Raspberry pi and AVR closer to reuse the same micro HDMI ro HDMI 1.5 mts cable, that worked days ago and didn't work.

I'm out of ideas. Can i fix this modifying the config.txt file?

I think that this video can help to understand my issue:

Sorry for my bad english, my natural language is spanish.

Thanks for the reply, Reddirt!
All that info it's in my previous thread, also as reference I put the link in a comment in this thread.
If I use the audio output jack it only pulls stereo PCM sound, I want use the raspberry via HDMI to pull audio because I want that AVR decode DTS, Dolby Digital, Dolby Digital +, DTS HD Master Audio and Dolby True-HD.

Let me clarify something, the HDMI that has the adapter is only the output used for video, I always used that adapter with the HDMI, it's true that now I have the other HDMI output connected. In my town everything is closed until Wednesday by Carnival here in Argentina, I would like to resolve this at the same way that it was working days ago.

Thanks for replying Da Flex .

I can confirm that HDMI-0 is connected for video and HDMI-1 for audio.
This is my cmdline.txt modified:

usb-storage.quirks=152d:1561:u boot=UUID=1108-5701 disk=UUID=3542a3ff-9e05-4d2b-80ce-0438958f4de6 quiet vc4.force_hotplug=1

However, issue persists

Perfect. I've removed vc4.force_hotplug=1.

My steps were
1) Enable debug logging
2) Plug the HDMI in the AVR
3) Reboot

Here are the logs:
https://paste.libreelec.tv/quality-garfish.log

Funny that the HDMI-1 is still connected to the AVR and I can get video disconnecting the USB Drive.

For that reason I bought a better Power supply for the Raspberry Pi 4 (5v 4a) because I thought that the power was not enough.
AVR is still without electrical connection.

Sure, thanks for help me!

after add drm.debug=0x04, plug HDMI to AVR and turn reboot
https://paste.libreelec.tv/factual-moth.log

modetest | pastebinit
https://paste.libreelec.tv/viable-dolphin.log

The user MikeKL that he helped me on the previous post and who faced with a similar issue, he recomended to create a EDID and based on the logs that I've shared here, he wrote the following

Video

m_deviceName      : hdmi:CARD=vc4hdmi0,DEV=0
m_displayName     : vc4-hdmi-0 (vc4hdmi0)
m_displayNameExtra: GSM LG TV SSCR2 on HDMI

Audio

m_deviceName      : hdmi:CARD=vc4hdmi1,DEV=0
m_displayName     : vc4-hdmi-1
m_displayNameExtra: MAI PCM i2s-hifi-0

Then I noticed something. I remembered that I took a screenshot when everything was working fine, just to document it in case that I need it in the future. "YMH HTR-3064" is not in my previous logs

Reason is that when I pulled the logs, the AVR is not connected to the electricity as I showed in the video.

Since now I will have the AVR plugged to the electrictiy to took logs and troubleshoot, and I will create an EDID with YMH HTR-3064 and for m_displayName I will set vc4-hdmi-1 (vc4hdmi1)

I will keep you posted shortly

I just connected the AVR to the electricity and with exactly the same connections than before... and it worked.

I'm totally out of ideas why booted showing video this time.

Here are the logs of everything working

-Using pastekodi via SSH:
https://paste.libreelec.tv/bold-cattle.log

Using modetest | pastebinit via SSH
https://paste.libreelec.tv/giving-seahorse.log

Regards