Comment # 3 on bug 1226807 from Jaan Rebane

A forum post about this:
https://forums.opensuse.org/t/not-able-to-create-minicom-lockfile-as-user/177517

In short:
It seems like group for /run/lock folder was changed, now it's root, it used to
be lock. (User should still be in dialout group for this to work.)

If there is a reason why it has to be in root group, there should be another
fix.

My temporary fix that worked was:
sudo cp /usr/lib/tmpfiles.d/systemd-suse.conf /etc/tmpfiles.d/
sudo nano /etc/tmpfiles.d/systemd-suse.conf
# Changed line 10 from
d /run/lock 0775 root root -
# to
d /run/lock 0775 root lock -