Retropie and Displaylink

A Former User

Hey everyone,
I am new here and I tried to get RetroPie working with a Lenovo ThinkVision lt1421. Its an USB-Display.

I managed to get Raspbian work with it without any problems. But RetroPie is working different and I dont know how to realise that. Is there anyone who can help me?
I was also able to install the normal Desktop on a RetroPie. If I open it, my Lenovo shows me the Desktop not my HDMI-Display (its just a random 5'' HDMI-Display). In all other cases my Lenovo is black and my HDMI-Display shows me everything, e.g. when I am playing games.
Well I want the Lenovo to show me always everything. Would be nice if this is possbile. If u need any informations, just ask.
I am working with a Raspberry Pi 3 B+

Thanks for any help :)

ps: I am not a native. So I am sorry for my english and if its not that good understandable

mitu

RetroPie on the PI is just a Raspbian Lite with the added configurations, so it's not that different from Raspbian. How did you make it work with Raspbian ?

A Former User

Ok. At first, thank you for your reply.
And I know RetroPie is working with Raspbian, but not with the pixel desktop (i think its called so).

Well I just added a file 99-plugable.conf in the /usr/share/X11/xorg.conf.d directory with the following content:

Section "Device"
  Identifier "uga"
  driver "fbdev"
  Option "fbdev" "/dev/fb1"
  Option "ShadowFB" "off"
EndSection

Section "Monitor"
  Identifier "monitor"
EndSection

Section "Screen"
  Identifier "screen"
  Device "uga"
  Monitor "monitor"
EndSection

Section "ServerLayout"
  Identifier "default"
  Screen 0 "screen" 0 0
EndSection

And after a restart the Pi will use the USB-Display. But this isnt working for RetroPie. And I think the reason is, that RetroPie is using a diffrent way to show the GUI than Raspbian Desktop, obviously.

mitu

@Potatochurchman Yes, on the PI, RetroPie uses the framebuffer and does not run over X.org, so unless you find a method to enable/configure the display without X, it won't work.

EDIT: a brief search shows it might be possible - https://unix.stackexchange.com/questions/453377/display-console-on-usb-screen-without-x-server.

A Former User

This post is deleted!

A Former User

Ok thank you very much. I didnt know how to call it, so it was hard to search for it ^^
I will try to get it work and reply if i success.

A Former User

Well I kind of reached my goal, but it looks like that:
stuff

EDIT: I dont know how to scale the picture. Sorry.

A Former User

Well and I used this: https://github.com/tasanakorn/rpi-fbcp
Just followed the instructions and it worked perfectly (kind of).
And if I change the resolution, it looks the same. So I have no idea how to fix it.
Just for you to know: It would be perfect, if I fix this. The delay is not too high and it looks smooth.