Using HD LCD with Retropie and RPi4

tyon2006

Hey! I'm trying to build a small mobile gaming device using 1 of 2 different types of screens. It did not work with the RPi 3 due to its limitation in display resolution, as these are super high resolution displays that required some custom HDMI timings and config to even get the Pi to display anything on it. I could get it close, but it couldnt seem to rotate correctly and display at full resolution or fill the screen with Raspbian, and Retroarch wouldnt even start up, stat. Anything over ~2k would result in weird screen doubling and unusual behavior. Note the resolution 1440*2560 and check out my old post here:

https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=224229&p=1488890#p1488890

and here:

https://www.raspberrypi.org/forums/viewtopic.php?f=38&t=243302&p=1677567#p1677567

I'd like to try this with an RPi 4, given the big boost to its display power. Does anyone have experience with one of the displays below + RPi 4 + Retropie? I would like to be able to rotate to landscape (these weird displays are portrait for some reason) and at full screen. Let me know if I should save my $27 lol.

SHARP LS060R1SX01
SHARP LS055R1SX04

mitu

While the resolution may be supported on the Pi4 - non-standard as it seems - the rotation will be problematic.

The Pi4 doesn't support any of the display_rotate options available in previous models and you'd need to manually configure rotation for EmulationStation and RetroArch (maybe even the terminal console).

(these weird displays are portrait for some reason)

The reason is they're made for mobile phones, hence the default portrait mode.

tyon2006

Makes sense. Any thoughts on retroarch/emulation station supporting these super high resolutions? On the Pi3, I couldnt even get it to boot up all the way. It would always stop before boot and say something about resolution. (I do not have a working screen at this time to get the exact message).

mitu

@tyon2006 said in Using HD LCD with Retropie and RPi4:

Makes sense. Any thoughts on retroarch/emulation station supporting these super high resolutions?

If you add a custom hdmi_mode and it's recognized by the Pi4, it should be used automatically.

On the Pi3, I couldnt even get it to boot up all the way

That's normal, since the Pi3 didn't support these large resolutions.