LinuxCNC on Raspberry Pi 4

Seems like the issue is no longer about installing linuxcnc but ethercat.
building etherlabmaster is for the birds and obsolete anyway...
The sticky I did in the ethercat section also works for the pi.
forum.linuxcnc.org/ethercat/45336-etherc...-how-to-step-by-step
Try it and if you get stuck, ask in the ethercat  section
 

I VNC'ed in and tried to change the graphics settings, but all I can see are overscan, pixel doubling, and screen blanking.  None of them changed the monitor output.

The cheap Wal-Mart "onn" monitor displays the other RPi 4 stuff fine.   Just "no signal" on this image once it's passed the splash screen.

I have this old Motorola dock I've always used with RPis.  This time it has an image, but it's still this, weirdly horizontal slant.  It's not scrolling around or anything.   overscan, pixel doubling, and screen blanking didn't fix anything. 

 

Hey Danny, in your config.txt , try changing your graphics driver from kms to fkms
That was the issue for me at least, when my always rpi screen didnt work with a new image.

dtoverlay=vc4-fkms-v3d

Hmmm... ok, that made it WORK on the Onn monitor. But the Motorola HDMI docking station just went dead. No-signal instead of a slanted screen.