awalls at radix
Jul 29, 2009, 6:24 PM
On Mon, 2009-07-27 at 11:09 +0530, Ravi A wrote:
Re: Fwd: [UNKNOWN IVTV CARD] (cx23416) AverMedia M113-C
[In reply to]
> Andy Walls wrote:
> > > Hi Andy,
> > >
> > > I did some more testing comparing the patches. The dropouts appear to
> > > be because of the VCO related patches. The versions before the VCO
> > > center frequency patch do not show this issue. I was mislead earlier
> > > (into thinking all the versions had the dropouts) as I was just doing
> > > an unload and load to move across versions - this does not seem to be
> > > clean, the register writes may not be completely reset. If I do a cold
> > > boot in between, then with pre-VCO version I am able to see that there
> > > are no dropouts. I also checked the patches you submitted to the
> > > staging repository and there seem to be no dropouts with this too.
> > >
> > > I will continue to do more testing to double-check. Let me know if you
> > > think the above is reasonable.
> > >
> > Ravi,
> > I'm going to leave the cx25840 module alone for now. I really don't
> > have time to chase problems with changing the VCO operation and it
> > wasn't needed to get your card working (AFAICT).
> > My pull reuqest only include the changes needed for you card (so far)
> > and the PARTSNIC tuner.
> > So what's left? You said you had some noisy/weak audio right? I'll try
> > to add the v4l2-dbg support to the wm8739 module sometime this weekend.
> > I'm essentially going to mimic the implementation in the cs5345 module.
> > That way, you'll be able to experiment with wm8739 settings.
> > Regards,
> > Andy
> > > Regards
> > > Ravi
> > >
> Hi Andy,
> Yes, the VCO change was not needed for me to use my card.
> About the audio, it is not too bad, but it could be made much better
> if the gain in WM8739 is increased. Currently it does not seem to be
> using the full scale range of the ADC, and besides, there is
> attenuation on the board too, so the final output is pretty low.
> Increasing the WM8739 volume should help to boost the SNR a lot. I can
> experiment with the settings once you add the WM8739 support.
Please test the latest patch at
it adds a secondary set of user controls for manipulating the WM8739
audio controls via v4l2-ctl. You will see controls named
"secondary_volume", "secondary_mute", etc.
If these control settings are usable for Ravi, can you please comment on
the patch. It was the simplest way I could think of to effect the
change in a very generic way, that should work for any ivtv card. But
looking at it, I get the sense it could possibly be improved.
> The other issue I am seeing is the Composite input quality which I
> mentioned sometime back. There are jagged edges in red/yellow and
> sometimes white edges. Moving text is very jagged too. I think it may
> have something to do with the internal de-interlacing in the card, but
> I have no clue. I plan to try some register settings tomorrow. The
> S-Video input does not seem to have this problem and gives crystal
> clear picture.
I don't have any thought on this at the moment. Life got busy recently.
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