From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ron Cococcia Subject: intel8x0 dual codec issue Date: Mon, 07 Feb 2005 23:43:39 -0500 Message-ID: <4208437B.3080207@request.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Hello, I'm having a little trouble with a dual codec setup that I am using. The motherboard has an Intel 815 chip (82801BAICH2). The motherboard has the primary (00) codec, which is an AD1885. A secondary (01) codec has been added over a CNR connector. This one is a CS4299. The secondary codec uses the timing values generated by the primary. I had been hearing some distortion in the audio. It was quite noticeable. Using a wav file of sine waves that has different frequencies (440, 880, 1760, 3520) at 44100Hz, I could see that there was some jitter on a scope. As the frequencies went up, it got worse. I then created another test file with the same frequencies, but sampled at 48000Hz. Playback of that audio was extremely clean on the scope. Looking into it more, I noticed that the PCM front DAC (ac97#1-1) was not adjusting itself to the appropriate frequency. The DAC on the primary codec was switching between 44100Hz and 48000Hz when I played the different samples. I'd like to have the secondary codec reflect the output rate that is being sent to it. How might I get it to do this? Is it a bug (should the codec front DAC on the secondary codec reflect the appropriate frequency?), or how is it intended to work? Thanks in advance, Ron ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click