[linux-dvb] Re: Driver problems

[Torbjörn Jansson <torbjorn.jansson@mbox200.swipnet.se>]

> > I have tried changing the pwm value and checked that it was 
> used but it
> > didn't help.
> > The channel changing problems is still there.
> 
> How much and in which direction did you try? And what card 
> you are using?
> 

I have a hauppauge/technotrend dvb-c card 2.1, I got it from usa-x.org

I have tried to both decrease and increase it a little bit from the default
of 0x40 and I have tried to change it a lot, like 0x70 and 0x20 but the only
difference I saw was that I wasn’t able to get a lock when trying czap if I
changed pwm too much.

It's a bit hard to test reliably because of tuning problems.
For example if I tune to DisMix after loading the modules and get a lock,
and then try to tune to DisMix again it almost never works, but if I change
to ESPN, wich is recived realy well, and then back to DisMix I usualy get a
lock on DisMix but not always.
So I usualy have to change channel a few times before getting a lock.

> > First time I run czap I get this and bad reception:
> > ---------------------
> > [szap]# ./czap DisMix
> > using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> >  42 
> DisMix:322000000:INVERSION_AUTO:6875000:FEC_NONE:QAM_64:4100:4356:1016
> >  42 DisMix: f 322000000, s 6875000, i 2, fec 0, qam 3, v 
> 0x1004, a 0x1104
> 
> Try not to use auto_inversion, seems also cause some trouble. Use
> inversion_on or inversion_off, which ever it is.
> 

I have tried that too, I had to use INVERSION_ON but that didn’t make any
difference.

> > And then if I try to run czap again it doesn't lock and I get this:
> >
> > ---------------------
> > [szap]# ./czap DisMix
> > using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> >  42 
> DisMix:322000000:INVERSION_AUTO:6875000:FEC_NONE:QAM_64:4100:4356:1016
> >  42 DisMix: f 322000000, s 6875000, i 2, fec 0, qam 3, v 
> 0x1004, a 0x1104
> > status 07 | signal 9b9b | snr d2d2 | ber 000041a0 | unc ffffffff |
> > status 07 | signal ffff | snr f0f0 | ber 000041a0 | unc ffffffff |
> 
> Check kernel logs (dmesg), when playing with PWM and getting bad
> reception, I did see a LOT of ARM crashes, Outcom errors and so on.
> Reloading the driver helps.


When I tried to change the pwm I also turned on verbose=1 so I can see the
afc, but it was always at "(-4) 26856Hz" and sometimes at -5.



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