Emulations slow Pi Zero 2

mash.m

Hi,

i just finished my Switch Lite Retropie build.

Pi Model or other hardware: Raspberry Pi Zero 2 W
Power Supply used: Boost from Lion Battery (capable of delivering 2A)
RetroPie Version Used 4.8 Pre-build
USB Devices connected: Teensy as input device
Display: 5.5" OLED 1080x1920#

The display resolution is 1080 x 1920 not the opposite. i configured in the config.txt:

max_framebuffer_height=1920
hdmi_group=2
hdmi_force_hotplug=1
hdmi_mode=87
hdmi_timings=1080 1 100 40 90 1920 1 8 2 4 0 0 0 60 0 152000000 3
display_rotate=1
#dtoverlay=vc4-fkms-v3d

As you can see it is running fine. But Amiberry is running very slow with at least 5fps. Top shows:

while running a game demo.

My guess is that the Pi Zero is not capable to render 1080x1920 via gpu. at this moment it is difficult to connect an other display with a lower resolution to check. this will be my last option. But do you have any hints?
PS1 Emu runs better, but not smooth. SNES is ok, but i can see some screen tearing.

i would like to give the D3 option (pixel doubling) a chance, but i can not activate it in raspi-config cause of missing screen dimensions.

Markus

mash.m

Amiberry Display config:

YFZdude

@mash-m said in Emulations slow Pi Zero 2:

The display resolution is 1080 x 1920 not the opposite. i configured in the config.txt:
max_framebuffer_height=1920

display_rotate=1

?!?
Wouldn't it be 1920x1080 if you changed the option to read display_rotate=0?

hdmi_mode=87

This mode is listed as 2560x720 @ 25Hz on the raspberry documentation. I think you would want hdmi_mode=82 for 1920x1080 resolution.

Also it looks like the documentation mentions hdmi timings as such:

hdmi_timings

This allows setting of raw HDMI timing values for a custom mode, selected using hdmi_group=2 and hdmi_mode=87.

If you don't use mode 87, then your config line with all those custom timing settings shouldn't be active/necessary

https://www.raspberrypi.com/documentation/computers/config_txt.html
.

mash.m

@YFZdude

No, pixel orientation is 1080 x 1920, custom timing is needet:

https://de.aliexpress.com/item/1005004285318699.html?spm=a2g0o.order_list.0.0.642c5c5fBesper&gatewayAdapt=glo2deu

HDMI Mode 87 on Group 2 is for custom timing.

Mode 87 on group 1 is

87

2560x720

25Hz

64:27

Pi 4

YFZdude

@mash-m
Ok yeah I mixed up the CEA and DMT tables a bit there.

mash.m

Hi,

screen tearing is almost gone with some extra buffer in config.txt

extra_transponse_buffer=2

What i found is that this extra buffer will help while dispaly rotating.