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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?

Sorry, i thought i filed it in the "German" section. Could someone please move it there?