@darkpaladin said in RPi4 dual screen with touchscreen:

The immediate issue I have is with the FKMS driver. The Waveshare touchscreen requires me to disable the FKMS driver and use its own configuration, especially since I want to rotate 90 degrees. But if I disable the FKMS driver, RetroPie runs into the SDL/EGL error and will not load the GUI.

On the PI4, disabling the (f)kms overlay/driver will result in an unsupported configuration, with any GPU drivers disabled. You won't be able to use RetroPie with it.

Is there a different driver I should try loading, or do I need to submit a feature request and wait?

No, there isn't. Not sure why the Waveshare screen needs the standard Pi4 GPU drivers disabled - maybe because of rotation support ? In any case, using both screens will require X11/X.org running, at which point you may be able to rotate the display/screens using xrandr/arandr. It's not a supported configuration for RetroPie, but it may help you using both screens at the same tie.

What's your use case ? When do you want to display the marquee - gameplay/game browsing ?

You'll have to ask the image author(s) for guidance, we don't support 3d party images - https://retropie.org.uk/forum/topic/3/read-this-first.

@Riverstorm No, just select HDMI and that's all. If you have any issues, post in the stickied topic.

Did you ever get this working? I just came to realise that a mirrored monitor setup with 2 screens would be really handy for me on my Pi4 with Retropie.

@philipmather ditto /opt/retropie-player1/e...s.../scripts/inputconfigurations.sh has hard coded rootdir.

@svera so does AdvanceMame 😉

Or just say i have 2 screens and on 1 i want the main going thin like character moving and ike this and on the other the second screen where is map inventory etc and then if its possible if i dont play ds games it will be mirrored

I tried this script but it is not stable and the emulation returns to the 1st screen

#!/bin/bash

This script will run a program in fullscreen mode (no borders or title bar etc) on a second monitor. It can used for many programs and on either the primary or secondary monitor

#This is the executable file or path
PROGRAM='emulationstation'

This is the output of wmctrl -l for the program that we are using

NAME='emulationstation'

This is the device name of the monitor we want to display the program on

DEVICE='HDMI-1'

If you want the program to be fullscreen on your second monitor this variable should be the width of your primary monitor

PRIMARYWIDTH=1920

Run the program , then wait a bit before carrying on If your program doesn't load in time then try increasing this value

$PROGRAM > /dev/null 2> /dev/null & disown && sleep 3

Set the Open GL environment variables Set the vertical blanking to on

__GL_SYNC_TO_VBLANK=1

And make sure OpenGL syncs the correct monitor

__GL_SYNC_DISPLAY_DEVICE="$DEVICE"

Do we want a screensaver

#SDL_VIDEO_ALLOW_SCREENSAVER=0

Set the dimensions of the program in the monitor

wmctrl -r "$NAME" -e '0,'$PRIMARYWIDTH',-1,-1,-1'

Maximize it

wmctrl -r "$NAME" -b toggle,fullscreen,maximized_vert

@gojira said in Official screen AND hdmi:

My goal is to make a mini gaming machine that I can use "portably" as well as plugged into a monitor.

I am also trying to do this! Did you succeed? If so, I'm very curious to hear about it!