From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clemens Ladisch Subject: Re: trouble using S/PDIF input on CMI8738-MC6: C-Media CMI8738 (model 55) Date: Thu, 21 Aug 2014 12:31:28 +0200 Message-ID: <53F5CA80.8020300@ladisch.de> References: <53EA40EB.2060201@seniorblanco.com> <53EB80C3.7020909@ladisch.de> <53EB9C3B.2070602@seniorblanco.com> <53F53B4C.20905@seniorblanco.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from dehamd003.servertools24.de (dehamd003.servertools24.de [31.47.254.18]) by alsa0.perex.cz (Postfix) with ESMTP id 315E926571A for ; Thu, 21 Aug 2014 12:31:31 +0200 (CEST) In-Reply-To: <53F53B4C.20905@seniorblanco.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Jon , alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org Jon wrote: > i/o error and resulting 44-byte file of silence. This indicates that the chip does not see any S/PDIF signal. Can't you connect some S/PDIF output to an input for testing? > I'm wondering if this problem could be really just as simple as > someone having guessed wrong about the correct value there having not > had this particular model on hand to test with? C-Media chips were very common once upon a time, and S/PDIF input always worked just fine for everybody else. There are no GPIOs, so the only possible hardware implementation is to connect the S/PDIF input directly to the chip's input pin(s). The Windows driver for this board is the standard C-Media driver, so there isn't any additional hardware that needs to be programmed. I don't know anything that could be done. Regards, Clemens