Hi @Quasar - I don’t think kmsprint will work on my 3b+ as I’m not using the kms driver. I need to find an equivalent for the older Pi way of doing things.
I’m aware that there was an issue with getting interlaced working under kms which should have been fixed in the kernel update released a few weeks ago (October). Which kernel are you on?
I am running Bookworm (kernel version 6.6). Do you plan to stick to PI3 or switch to a newer one? Newer ones have a different video driver (kms vs fkms in older ones)
For this first version, I’ll stay on the Pi 3B+ (it’s almost ready to be installed in the car now), but I want to get it working on Pi4 / Pi5 to make sure I can keep getting updated software versions with new features and fixes, so getting this 480i resolution working properly with the kms driver is definitely on my list.
I’m hoping to get some time to work on this next week or early December.
try in config
dtoverlay=vc4-kms-v3d → dtoverlay=vc4-fkms-v3d
kms work only EDID i and I couldn’t get the 480i to work correctly on KMS, just as the pi4 is more finicky about various custom timings than the 5
custom timings work well on 2 and 3 on legacy or actual with FKMS
5 well works on kms with custom EDID, but i rewrite EDID eeprom om hdmi-vga
also custom timing well works on nvidia, i I selected the values on windows notebook with rtx3070, intel UHD It doesn’t always work well at low resolutions.
i use “CRT” for adjusting the values and “EDID/DisplayID Writer” from monitortests
also i use hdmi-vga on ag6200 chip, he work and 320x240p witn AND type HV to S
BUT(!) nvidia and pi 5 KMS not work under 11.5 MHz Pixel clock and Interlaced or I didn’t understand how to do it.
this works timmings for comand 2.0
try on windows and CRT, then rewrite EDID on hdmi-vga and try it on PI with KMS
i can started pi 3 with actual bookworm and KMS under custom EDID 480i, timmings:
also, i use this RGBhv to RGBs AND type, the most important thing is that it supports only negative V and H sink, positive sink not works, if you need positive polarity, use XOR type
Hi @niz - great to see this progress. I haven’t had a chance to look again at getting this going with anything other than the Pi3B+, but would like to pick it up again soon. So what were the exact steps you needed to take to get 480i output on a pi5? If you have a custom EDID, can you share it here?
you used KMS or FKMS video driver? (in config.txt)
use KMS and update at the beginning OS, clean installation actual version bookworm not good works with custom EDID
sudo rpi-update
sudo apt update
sudo apt upgrade
https://forums.raspberrypi.com/viewtopic.php?p=2254541#p2254541
4:3 460i for comand 2.0, the picture will probably move off the screen, a little later I will study RNS-E, but I can’t give dates
