Resume from suspend (udevadm settle)

When system resumes from suspend (after /usr/sbin/pm-suspend) it executes '/etc/init.d/tvheadend start' command (mantis and ivtv modules are need to be removed on suspend). System stops executing further commands and stops on: 'udevadm settle' in /etc/init.d/tvheadend script. What might be the cause ?

Regards
Janusz