Composite on Rpi4B with bookworm

Hi, I'm trying to enable an analog display, the things I've added to my config.txt are below

enable_tvout=1

And

dtoverlay=vc4-kms-v3d,composite

As well as

vc4.tv_norm=PAL

in cmdline.txt However when booting, the screen on the display shows the rainbow image, then flickers white, a second later the raspberry pi logo splash screen shows up for a split second and the screen goes black with nothing else. I read somewhere that the white flash is the pi deciding not to use that display, but what else do I have to change so it does? I've tried changing the config.txt to read

dtoverlay=vc4-kms-v3d,composite=1

And

vc4.tv_norm=PAL video=Composite-1

to cmdline.txt Like I saw someone do online but that hasn't worked either.

No, that is a composite analogue video and has nothing to do with the GPIO 2x20 pin

I suspect the posted video is taken in a eyepiece on an old analogue video camera

?

I figured it out anyways, I needed to change

dtoverlay=vc4-kms-v3d,composite=1

to

dtoverlay=vc4-fkms-v3d,composite=1

Ah ok

Well done

From this random forum post https://forums.raspberrypi.com/viewtopic.php?t=336182

Great

Now I got curious what the difference is between a kms and a fkms. And the answer is, F stands for Fake in FKMS.

Nice work. And could you post a complete set of settings so if someone else stumble on the same issue there is a complete solution here?