Tvheadend

Have setup tvheadend (in synology DS 412+) against a dreambox DM 800 running oscam with newcamd. The tvheadend backend shows as 'connected' in the dreambox (oscam webif) but no channels are picked up. When checking the log file for tvheadend I find a recurring message:

'/dev/dvb/adapter0/frontend0' - not found

When checking there is indeed a file 'frontend0' in that path owned by root:root. Is this correct? I would expect the file to owned by tvheadend (video).

Can anyone advice me on how to clear this issue?

crossposted in http://forum.synology.com/enu/viewtopic.php?f=190&t=63142