[mythtv-users] Mythbackend runs from command line, but not from init script (DVB issue?)

[Phil Bridges]

For some reason, the majority of my problems happen when the power
goes out.  This time, the power outage lasted longer than my UPS'
batteries, and it didn't shut down.

Anyway, I have a slave backend that refuses to start the backend
process from the init script (on Gentoo):

        ebegin "Starting MythTV Backend"
        start-stop-daemon --start --quiet --chuid mythtv \
                --exec /usr/bin/mythbackend \
                --make-pidfile --pidfile /var/run/mythbackend.pid \
                --background -- --verbose ${MYTH_VERBOSE} \
                --logfile /var/log/mythtv/mythbackend.log
        eend $?

The pertinent part of the backend log shows:

2008-08-02 20:40:32.222 TVRec(2): Start channel: 806.
2008-08-02 20:40:32.223 DVBChan(2:1): Opening DVB channel
2008-08-02 20:40:32.224 DVBChan(2:1) Error: Opening DVB frontend device failed.
                        eno: No such file or directory (2)
2008-08-02 20:40:32.224 DVBChan(2:1): Closing DVB channel
2008-08-02 20:40:32.230 TVRec(2): ClearFlags(RecorderRunning,) -> 0x0
2008-08-02 20:40:32.231 MythEvent: RECORDING_LIST_CHANGE

The weird thing, though, is that /usr/bin/mythbackend starts up fine
(from eithe root account or mythtv account).  The DVB device has been
given 777 privileges, show it's not an access issue.  Is there
anything in particular I should look for here?