[linux-dvb] Problem with Avermedia AverTV DVB-T USB2.0 (a800)

Matt Holgate matt-bulk-linux-dvb at holgate.org.uk
Thu Aug 11 00:20:39 CEST 2005


Hi,

I'm having an intermittent problem with my Avermedia USB2.0 DVB-T a800 
box. I'm running kernel 2.6.13-rc6 and built the latest drivers from 
dvb-kernel CVS (I also tried the drivers distributed with 2.6.13-rc6).

The problem seems to happen about 50% of the time, and occurs when the 
channel is set using tzap (also built using latest dvb-apps CVS). If I run 
tzap, then use dvbstream piped into mplayer (in another terminal), then 
about half the time it seems to tune correctly, the other half I get a 
blocky corrupt mess.

Oddly, tzap seems to think it is locked onto the signal. Even more 
strangely, it always gives 2 plausible lines of output, followed by all 
subsequent lines with a signal strength of 0, an SNR of ffff and a ber and 
unc of 0! (note that it does this whether or not the tuning is 
successful). Surely something is wrong there, as the values do not seem 
at all sensible (see below).

The same tuning issue happens with MythTV, however it only occurs 
immediately after starting the backend. If I manage to get it to lock onto 
a signal once, then changing channel works *every* time until I next 
restart the backend. This makes me think that there is some kind of device 
initialisation problem.

Does anyone have any idea what is wrong here? I don't have a clue, but I'd 
love to get it working :(.

Thanks in advance for all your help, I really appreciate it.

Best wishes,

Matt Holgate.


matt at aragorn:/lib/modules/2.6.13-rc6-k7-matt-dvb/kernel/drivers/media$ 
tzap  "BBC One Scot"
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
reading channels from file '/home/matt/.tzap/channels.conf'
tuning to 634166670 Hz
video pid 0x00c9, audio pid 0x00ca
status 1f | signal a429 | snr 0001 | ber 001fffff | unc 0000ffff | 
FE_HAS_LOCK
status 1f | signal a42b | snr 0001 | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 0000 | snr ffff | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 0000 | snr ffff | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 0000 | snr ffff | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 0000 | snr ffff | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK






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