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I took the PID solution and modified the code a little. I initialized spindle-index-enable to 1 when starting Lcnc.
I also used ABS on spindle-Pos-fb-abs.
The spindle is positioned, but only in certain cases:
- When starting Lcnc, if I've never rotated the spindle at speed and the angular displacement is small (less than 20 degrees).
- If I rotate the spindle first and then try to orient it, almost every time, it will start at maximum speed, without orientation.
- If I rotate the spindle first, and then reposition it slightly by hand with my index finger, I can orient it, but always with small successive angular displacements.

It's progressing little by little, but from my point of view, it's more tinkering than mastery...

 

ec_generic should autoload when ethercat master service is started and "generic" is mentioned in /etc/ethercat.conf
There was an issue where it didn't and the user had to modprobe it manually after start of linux.
Suspected Secure boot but it was off like in your case. Never understood why it didn't load.
I guess you have to experiment to see if you can get it to autoload.

 /usr/sbin/ethercatctl is the file that loads the modules when the service is started, it's a bash script.
 

OK, found it! It because of G64... Case closed

Only the parport gets disabled or LinuxCNC also show an error? (Not sure if the parport gets disabled after a following error?)

Perhaps a parport driver is interfering, what does lsmod show?

Is in the BIOS the parallel port set at ECP/EPP/AUTO? Try EPP or ECP

Too aggressive timing for the steppers?

Power Management in BIOS?