Theodore Ts’o doesn’t understand how this **** works either.
I do find it very difficult sometimes to figure out why a particular systemd service gets started, and when I tried putting together a battery target which would automatically shut down various daemons that I don’t need when I want to save power, it apparently somehow caused the brightness keys (fn-F5 and fn-F6) to mysteriously stop working — and as I expected, it was impossible to debug.
Who’s Theodore Ts’o you ask? Go to your console, type
df -T. You see the
ext4 in the “Type” column? Yeah, he maintains that for the linux kernel. So I don’t feel so bad anymore for being lost in the systemd maze …