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[Karel Marik <kaja.marik@xxxxxxx>]

Workaround indicated in https://bugs.launchpad.net/mythbuntu/+bug/556204
resolved my issue. Modify /etc/init/mythtv-backend.conf as follows:

Replace line

start on (local-filesystems and net-device-up IFACE=lo)

with

start on (local-filesystems and net-device-up IFACE=lo and started udev-
finish)

My mythtv is working now for several restarts. The only drawback is the
boot is a bit longer.

-- 
tda1004x: timeout waiting for DSP ready
https://bugs.launchpad.net/bugs/486264
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Status in “mythtv” package in Ubuntu: Incomplete

Bug description:
Binary package hint: mythtv

MythTV causes problem with DVB-T card firmware. Symptoms are as follows:

1) After mythtv installation everything works fine for many restarts (few days)

2) Suddenly, firmware is not loaded. dmesg gives 
tda1004x: timeout waiting for DSP ready
tda1004x: found firmware revision 80 -- invalid
tda1004x: firmware upload failed

3) Uninstall and reinstall of mythtv package revert this state so card (and mythtv) is working again well. dmesg gives
tda1004x: found firmware revision 20 -- ok

I repeated this 1-2-3 cycle three or four times since karmic-koala install.

===========================
Using:
Ubuntu 9.10 Karmic Koala
mythtv 0.22.0 (both backend and frontend)
tv card: AVerTV Digi Super 007 [Multimedia controller: Philips Semiconductors SAA7131/SAA7133/SAA7135 Video Broadcast Decoder (rev d1)]
firmware: /lib/firmware/dvb-fe-tda10046.fw installed from linux-firmware-nonfree package