6by9

> > Is it better to create bcm2712-rpi-ds.dtsi to avoid merge conflicts with upstream gaining similar common sections? > > We could rename bcm2712-rpi.dtsi now - it might save popcornmix...

> Flash a RaspIOS to CM3+ and check the display. No version of Raspberry Pi OS has ever enabled DPI displays by default. What changes have you made to config.txt...

Well that isn't a config.txt that has ever been shipped with Raspberry Pi OS. References to Fedora and U-boot mean almost all bets are off, although it looks to be...

I'm not going to try and replicate your full setup as it appears you have other things in play. Fresh Raspberry Pi OS Lite Trixie image on a CM4S. Running...

I have no hardware that allows me to connect a CM4S (or CM3) to any of my DPI panels, as they all have the standard 40pin header. Testing a Pimoroni...

> Cross-link: https://raspberrypi.stackexchange.com/questions/153820/cm4s-dpi-display-not-working https://raspberrypi.stackexchange.com is not a forum that any of the Pi employees I'm aware of follow, whereas we do follow Github issues and [our forums](https://forums.raspberrypi.com/). I've picked up...

> most likely on GPIO 0-3 as they carry the clock and sync signals. **Checking them on an oscilloscope would be my next move.**

As a random thought, I've enabled your configuration with a VGA666 board attached (simple resistor ladder DAC for VGA). Your settings work fine with it when feeding an Acer VGA...

@sbp-bvanb @jschilperoord Any follow up on this one?

I'm suspecting this is an Arch Linux issue, or possibly you have an old firmware (`vcgencmd bootloader_version`). vc4 initialises fine on Raspberry Pi OS, and graysky as one of the...