asvravi at gmail
Jul 26, 2009, 10:39 PM
Andy Walls wrote:
Re: Fwd: [UNKNOWN IVTV CARD] (cx23416) AverMedia M113-C
[In reply to]
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
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.
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.