Rpi 4 poor performance on 4K TV
johndoe348 last edited by johndoe348
I get awful frames and lag in emulationstation and psx roms on my 4K TV at any resolution. I've set the resolution of rpi in /boot/config.txt to several hdmi_mode including 480,720, 1080. At lower resolutions emulationstation is more responsive, but doesn't make a difference for psx roms. I've also modified retropie_setup.sh resolutions and set 4kp60=0.
When I connect a 7" 800x480 touchscreen via ribbon cable, everything runs smoothly regardless of what the resolution is set to.
I've added these to my config:
BIOS = scph1001.bin
emulator = lr-pcsx-rearmed
TV is set to game mode
I've monitored the cpu speed and it doesn't drop below 1950000
Followed this guide to install: https://github.com/RetroPie/RetroPie-Setup/wiki/Manual-Installation
VictimRLSH last edited by
Has pcsx-rearmed been optimized for the Pi 4's GPU? You could be missing out on a HUGE performance boost if the CPU has to do all the heavy lifting for a 4K output...
There might be a bug in RetroArch which picks the first resolutions offered by the display instead of the current resolution. If the first resolution is 4k@30fps, you'll see it as a slowdown.
You can check the resolution picked by RetroArch by running with verbose logging enabled from the Runcommand launch menu and then looking into
/dev/shm/runcommand.log(which you can upload to pastebin.com if you want us to take a look at it).
You can forcibly disable the 4K resolutions by modifying
config.txton the boot partition and adding
[hdmi:0] hdmi_max_pixel_freq=200000000 [hdmi:1] hdmi_max_pixel_freq=200000000