From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Revell Subject: Re: Re: [PATCH] Add support for Acer TravelMate and Date: Tue, 28 Feb 2006 18:54:08 -0500 Message-ID: <1141170850.5860.69.camel@mindpipe> References: <200602282345.k1SNjPfu020504@auster.physics.adelaide.edu.au> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <200602282345.k1SNjPfu020504@auster.physics.adelaide.edu.au> 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: Jonathan Woithe Cc: Rimas Kudelis , alsa-devel@lists.sourceforge.net, Paulo Matias List-Id: alsa-devel@alsa-project.org On Wed, 2006-03-01 at 10:15 +1030, Jonathan Woithe wrote: > > On Wed, 2006-03-01 at 09:52 +1030, Jonathan Woithe wrote: > > > The "CD" input on the ALC260 is an analog input. It expects the CD drive to > > > do all the audio decoding and present an ordinary stereo signal to this pin. > > > If when playing a CD and enabling the "CD" control you get no audio that > > > strongly suggests that there is no audio signal running to that pin. > > > However, if there is no analog connection to the ALC260 one does wonder > > > precisely how these systems are expected to play CDs. The only option > > > left would be for software to read the raw CD bitstream (which isn't a straight > > > audio bitstream), decode it and then send the resulting audio bitstream to > > > the DAC. Given that CD drives are more than capable of doing all this it would > > > surprise me if this were the case. > > > > > > One thing worth checking though - have you tested *all* ALC260 inputs with > > > the CD playing? Maybe Acer connect the CD audio to some other ALC260 pin. > > > > I would not be surprised if some vendors were leaving out the DAC from > > their CD drives, and expect you to play audio CDs in digital mode. I > > believe this is how Windows Media Player works by default (it also > > allows it to generate visual effects from the CD audio). > > Ah, right. I wasn't aware of that. If that's its default behaviour then > perhaps the Acers do expect the OS to use digital mode for playing CDs. If > this proves to be the case then we'll revise the "acer" model to omit the CD > controls. Are #1843 and #1847 related to this problem? Those both involve Acer systems but with Sigmatel codecs rather than Realtek. Lee ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642