add framebuffer size increase to usercfg.txt
working config for 10.5" 1080p @ 50Hz panel as well as 12" 1080p @ 50Hz panel, both sourced from alibaba last year:
# 10.5" 1920x1080 @ 50Hz panel from alibaba
hdmi_cvt=1920 1080 50 3 0 0 0
hdmi_group=2
hdmi_mode=87
add framebuffer size increase to usercfg.txt
working config for 8.9" 2k 60hz panel from Electric Magic:
ubuntu@piframe-one:~$ cat /boot/firmware/usercfg.txt
# Place "config.txt" changes (dtparam, dtoverlay, disable_overscan, etc.) in
# this file. Please refer to the README file for a description of the various
# configuration files on the boot partition.
gpu_mem=512
disable_overscan=1
# 8.9" 2k LCD panel from Electric Magic via Amazon ( https://www.amazon.com/gp/product/B082YFY8PW )
# 2560x1600 @ 60Hz (16:10)
hdmi_group=2
hdmi_mode=76
max_framebuffer_height=2560
max_framebuffer_width=2560
framebuffer_width=2560
framebuffer_height=1600
framebuffer_depth=32
framebuffer_ignore_alpha=1
add framebuffer size increase to usercfg.txt