Raspberry pi 4 composite out (RCA) issues : raspberry_pi


Hello! I attempting to attach my raspberry pi 4 mannequin B with TV with out HDMI (mannequin JVC AV-2953WE) by audio jack 3.5 - RCA cable. When i activate raspberry, i can see first colour gradient, then kernel messages, then black display. It looks as if after booting raspberry change video mode or smth like that.

  1. Cable realy work: i examined with multimetr, i can see proper colour image with out defects when OS booting (however after booting simply black display).

  2. I first tried unsuccessfully utilizing Lakka with the required changes . Then I triyng with raspberry pi os 2021-10-30-raspios-bullseye-armhf.img however i cant see any image after booting.

I simply set up OS on SD card:

$ sudo dd if=2021-10-30-raspios-bullseye-armhf.img of=/dev/sda bs=512 standing=progress
$ sudo sync

Copy configs (full on disroot privatebin):

$ egrep -v "^($|s*#)" config.txt
enable_tvout=1
hdmi_ignore_hotplug=1
sdtv_aspect=1
hdmi_force_hotplug=0
dtparam=audio=on
camera_auto_detect=1
display_auto_detect=1
dtoverlay=vc4-kms-v3d
max_framebuffers=2
disable_overscan=1
[cm4]
otg_mode=1
[all]
[pi4]
arm_boost=1
[all]
$ cat cmdline.txt
console=serial0,115200 console=tty1 root=PARTUUID=1c0d4e2d-02 rootfstype=ext4 fsck.restore=sure rootwait plymouth.ignore-serial-consoles

And create empty file "ssh".

$ > ssh

I related with ssh (throught ethernet cable) and cant discovered any errors in journalctl logs.

3. On TV setted colour mode auto and proper video channel. I attempted with PAL (with sdtv_mode=2) - no adjustments.

4. I havent any followers on raspberry, however it fairly works (I performed in Lakka in different place with HDMI monitor).

Can anybody counsel any resolution or route the place to search for the issue? Has anybody run composite video output on raspberry pi 4 (I do know that in the beginning of gross sales this operate didn't work)?



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