08-06-2024, 06:51 PM
I ran some tests a while back using Pi-3 and 3B+ HDMI with some locally attached touchscreens and I got those same video problems. I think it has something to do with the Bookworm KMS videocore driver and the particular HDMI core on the 3/3B+.
No probs with Pi-4 or 5.
No probs with Pi-4 or 5.