Comment # 5 on bug 930015 from Roberto Tolin Sommer

Ffado mixer detects the card and also my external firewire discs works without
problems. The kernel is the latest Thumbleweed 4.03.1.
The jackd -v message is the same:
jackd -v -t2000 -dfirewire -r48000 -p1024 -n5
jackdmp 1.9.10
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2014 Grame.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
Cannot create RT messagebuffer thread: Operation not permitted (1)
Retrying messagebuffer thread without RT scheduling
Messagebuffer not realtime; consider enabling RT scheduling for user

The problem persists selecting Realtime in Qjackctl or not.