# as operator-group user (gid=5 operator, uid=1002):
uid=1002 euid=1002 gid=5
open: Operation not permitted
# (blocked at diskopen's SYSCAP_RESTRICTEDROOT gate, not at the ioctl)

# as root:
disable  -> 0 errno=0 (OK)
enable   -> 0 errno=0 (OK)
enable2  -> -1 errno=16 (Device busy)  (EBUSY==dumper registered)