@zera said in Display Problem with CM4 Board:

We combine CM4 and the DPI display, however, we cannot enter the emulator and it only stuck in booting. It can work normally if we change to an HDMI display.

This seems like a problem with the DPI configuration/driver. Does Raspbian Lite works normally with the configuration - does it boot to a text console/terminal ? What emulator are you starting ? By default, RetroPie boots to EmulationStation, not to an emulator.

There is also a solution that we install retropie in Raspbian image, however, it also has a problem. It will flash the desktop of Raspbian when starting, begin the game, or exit from the game.

RetroPie is based on Raspbian Lite (not the Full/Desktop), running RetroPie (EmulationStation) under a desktop env on a Pi is not a supported or tested configuration.

@Rion Already saw it. Thanks. We try to keep up on Piboy DMG going's on's. :)

We'll add this as an option in our config.txt.

@Firebird_WS6 thanks for digging into this. I figured there was something but I doubt I would have found it.

@shylock since more or less every videogame supported by retropie is in 4:3, you're always going to get borders on the top and bottom (rather than the left and right that you would get with a 16:9 display. integer scaling won't make a difference.

with vertical MAME games it would be a nice fit, though: smaller borders on left and right than (un-rotated) 4:3 or 16:9 screens.

you'd also probably need to get a custom emulationstation theme done, unless someone has already done a square one, otherwise it's going to a look a little funky it think.

no idea about the performance...