Pi 4 with Pi Touch Display

I was typing up a post to ask for help getting LinuxCNC 2.9.2 running on a Raspberry Pi 4 B attached to a Raspberry Pi 7 inch Touch Display, when I finally figured out the solution. Thought I'd still make the post for helping others or possibly even future me if I have to rebuild this system one day.

The Pi Touch uses DSI for connecting to a Raspberry Pi and seems LinuxCNC doesn't have the required settings enabled in the config.txt by default. Not really a surprise as its probably an unusual pairing of hardware and OS.

The solution was adding the below text to config.txt

Thank you for your contribution.

Hello, I've the same issue on Rpi5 but your solution do not work completely.

I've on the boot the DSI display working well but after starting, Linuxcnc switch to the HDMI and I do not find anything in the configuration to display on the DSI and on the HDMI.

Do I've miss something ?