[mythtv-users] Avermedia 771 Card

Rob Willett rob.mythtv at robertwillett.com
Sat Aug 21 03:20:12 EDT 2004


I'm trying to get the Avermedia DVB-T 771 card to work. It's been a trying week
so far.

The system is as follows:

Generic 2.6.7 kernel on top of RedHat 9.0
The latest CVS of the DVB-kernel code from linuxtv.org.
The bytesex patches 2.6.7-kracken
Myth 0.15.1
A number of informal mt352.c patches...

The system has a Nebula DVB card and this works OK.

I have used the ethics-gradient setup for DVB and can get the Nebula card to
scan and tune, the Nebula card also works in Mythtv. 

The Avermedia card is a different issue. It will not scan dvb-t/uk-CrsyalPalace
and find channels. Since the same arial is used for both I figure that the input
signal is OK. I start the scan process and it simply comes back with tuning failed.

Ouput from scan command 
[root at mythtv scan]# ./scan -a1 dvb-t/uk-CrystalPalace
scanning dvb-t/uk-CrystalPalace
using '/dev/dvb/adapter1/frontend0' and '/dev/dvb/adapter1/demux0'
initial transponder 505833333 0 3 0 1 0 0 0
initial transponder 481833333 0 2 0 3 0 0 0
>>> tune to:
WARNING: >>> tuning failed!!!
>>> tune to:
(tuning failed)
WARNING: >>> tuning failed!!!
>>> tune to:
ERROR: interrupted by SIGINT, dumping partial result...
dumping lists (0 services)

(I cut short the scanning).

The modules load OK apart from the error on loading mt352.c highlighted below

Linux video capture interface: v1.00
bttv: driver version 0.9.15 loaded
bttv: using 8 buffers with 2080k (520 pages) each for capture
bttv: Bt8xx card found (0).
bttv0: Bt878 (rev 17) at 0000:01:06.0, irq: 5, latency: 32, mmio: 0xdc000000
bttv0: detected: Nebula Electronics DigiTV [card=104], PCI subsystem ID is 0071:0101
bttv0: using: Nebula Electronics DigiTV [card=104,insmod option]
bttv0: gpio: en=00000000, out=00000000 in=00ff84cb [init]
bttv0: using tuner=-1
bttv0: registered device video0
bttv0: registered device vbi0
bttv0: PLL: 28636363 => 35468950 . ok
bttv0: add subdevice "dvb0"
bttv: Bt8xx card found (1).
bttv1: Bt878 (rev 17) at 0000:01:08.0, irq: 10, latency: 32, mmio: 0xdc002000
bttv1: detected: AVermedia DVB-T 771 [card=123], PCI subsystem ID is 1461:0771
bttv1: using: AVerMedia AVerTV DVB-T 771 [card=123,autodetected]
bttv1: gpio: en=00000000, out=00000000 in=0090008f [init]
bttv1: using tuner=4
bttv1: registered device video1
bttv1: registered device vbi1
bttv1: PLL: 28636363 => 35468950 . ok
bttv1: add subdevice "dvb1"
mt352: Unknown parameter `debug'
bt878: AUDIO driver version 0.0.0 loaded
bt878: Bt878 AUDIO function found (0).
bt878(0): Bt878 (rev 17) at 01:06.1, irq: 5, latency: 32, memory: 0xdc001000
bt878: Bt878 AUDIO function found (1).
bt878(1): Bt878 (rev 17) at 01:08.1, irq: 10, latency: 32, memory: 0xdc003000
attach: checking "bt878 #0 [hw]"
find by pci: checking "bt878 #0 [hw]"
attach: "bt878 #0 [hw]", to card 0
attach: checking "bt878 #1 [hw]"
find by pci: checking "bt878 #1 [hw]"
attach: "bt878 #1 [hw]", to card 1
DVB: registering new adapter (Neb).
DVB: registering frontend 0:0 (NxtWave NXT6000)...
>>>> mt352_read_register: readreg error (ret == -5) <<<< Is this the problem?
DVB: registering new adapter (Ave).
DVB: registering frontend 1:0 (DVB-T Zarlink MT352 demodulator driver)...

I have setup the following /etc/rc3.d/S98avermedia 

#depmod -ae

case "$1" in

        echo -e "Inserting DVB modules into kernel"
        # Linux video
        modprobe videodev
        # bttv is required for bt878 and dvb-bt8xx
        # modprobe bttv  card=104
        modprobe bttv i2c_hw=1 card=0x68
        # modprobe bttv
        # core DVB
        modprobe dvb-core dvb_shutdown_timeout=0;
        modprobe v4l1-compat
        modprobe v4l2-common
        modprobe video-buf
        # Avermedia DVB-T card
        modprobe mt352 debug=1 force_card=0x1
        modprobe bt878
        modprobe dvb-bt8xx
        echo -e "Removing DVB modules from kernel"
        rmmod mt352
        # Avermedia DVB-T card
        rmmod dvb-bt8xx bt878
        # core DVB
        rmmod dvb-core
        # bttv (required for bt878 and dvb-bt8xx)
        rmmod bttv
        # Linux video
        rmmod videodev video-buf
        $0 stop && $0 start
        echo "Usage: $0 {start|stop|restart}"
        exit 1

exit 0

When I try and use the card in Mythtv all I get is a blank screen and error
messages saying no signal.

I figure that my problems are:

1) The card is not scanning and locking onto a signal.
2) The mt352.c code is pretty new and even though it says it works on Avermedia
771 cards it is still alpha code. There may be all sorts of subtle interactions
I know nothing about.
3) There have been a small number of postings about the 771 card but I'm
confused as to what the correct version of the mt352.c should be and whether
some of the patches mentioned are in the CVS version or not. 

I brought the Avermedia card by mistake, I wanted the older M179 card but
Avermedia in their wisdom have changed the bloody chipset. I hate manufacturers
who do this. Oh well, whinge off, let's make the dammed thing work.

Any help greatly appreciated.


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