Improving the #Pi: Encountered a DRM issue while trying to transpose output to support the 7" display on the #raspberryPi 5: The hardware doesn't support DRM's RGB888 pixel format. Here's the discussion and the fix now merged in the Pi's Linux kernel code:

https://forums.raspberrypi.com/viewtopic.php?t=380129

https://github.com/raspberrypi/linux/pull/6533