The goal

Run a tk-inter app from Docker on a headless Raspberry Pi

The tools

Raspberry Pi 4
Raspberry Pi OS Lite 64bit
4” HDMI screen
Docker

Install Portainer agent

docker run -d \
	-p 9001:9001 \
	--name portainer_agent \
	--restart=always \
	-v /var/run/docker.sock:/var/run/docker.sock \
	-v /var/lib/docker/volumes:/var/lib/docker/volumes portainer/agent:latest

Install xorg

sudo apt install

Issue 1: LCD isn’t full screen

https://www.raspberrypi.com/documentation/computers/config_txt.html#hdmi-mode

nano /boot/config.txt

Settings that seems to work for the console:

overscan_right=48
hdmi_force_hotplug=1
hdmi_group=2
hdmi_mode=14
hdmi_drive=2
config_hdmi_boost=4
sdtv_mode=2

Get current screen config:

startx
xrandr

Errors generated in log file:

sudo startx
X -configure
nano /var/log/Xorg.1.log

The answer may be in this log file.