was the only option I needed in config.txt to get emulation station to work from hdmi 1.
(I needed to use this as the fat micro hdmi adapter I was using pressed against the usb-c power connector)
These are the only options I have set in config.txt (audio and video on second hdmi port 1 work fine in emulation station)
# OVERCLOCK SETTINGS
arm_freq=1800 # CPU Frequency
gpu_freq=600 # GPU Frequency
over_voltage=2 # Electric power sent to CPU / GPU (4 = 1.3V)
# Enable DRM VC4 V3D driver on top of the dispmanx display stack
Additionally, after hours of messing with this, when I plugged it in today it was magically working. I had just rebuilt the box after an issue with SSD corruption. I'm still willing to pull data/test to help anyone else who has come across this issue. I also plan on rebooting a few times to see if this is a fluke.
@xsportseeker well i guess i read that all for nothing!! :) yeah im glad i read your second post because i was about to point you to that file. Glad you got it working. If you are interested in making .sh files to have all dos games show up in the gamelist or any other configuring help in dosbox feel free to ask.