Amiberry 3.3 / RPi 4 slow

[gordonfreemanjr]

@mitu @quicksilver Our case has made it to Amiberry FAQ:

https://github.com/midwan/amiberry/wiki/FAQ

[slimbrick]

[EDIT: I fixed my issue, so I tried to delete the post but it wouldn't let me]

[BuZz]

@slimbrick it would be more useful imho to leave your post and reply with your fix.

[slimbrick]

@buzz
You have a good point.

I had a very similar problem to this thread. I replaced my Pi 3 retropie with a Pi 4 and retropie was behaving in a jittery fashion with Emulation Station and the games weren't smooth. I also have a 4K Samsung Smart TV as did the original poster. Although I wasn't using Amiberry, I was using mame, daphne, and jzintv and I figured the same solution that @gordonfreemanjr used would work for me. So I added the five lines to my /boot/config.txt file that he listed in his "IT WORKS" post but lo-and-behold it did not work for me. tvservice -s was still showing a 4K connection when I expected 1080p.

My solution was simple with a twist. Starting from the stock config.txt, I uncommented and modified the following:

hdmi_group:0=1
hdmi_mode:0=16

It was necessary for me to add the :0 to get it to work. Now there are no jitters, the motion is smooth, and tvservice -s reports a 1080p connection.