From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erik Slagter Subject: Re: Specs available for Sweex External 5.1 with digital in/out USB 2.0 / C-Media CM6207 Date: Fri, 13 Jun 2008 23:40:47 +0200 Message-ID: <4852E95F.5040404@slagter.name> References: <4845A420.10804@slagter.name> <9e4733910806041038j171bee15j1ec3395e00d772bb@mail.gmail.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============3328192696808998268==" Return-path: Received: from eriks.xs4all.nl (eriks.xs4all.nl [83.160.41.216]) by alsa0.perex.cz (Postfix) with ESMTP id 91478244F3 for ; Fri, 13 Jun 2008 23:40:48 +0200 (CEST) In-Reply-To: <9e4733910806041038j171bee15j1ec3395e00d772bb@mail.gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Jon Smirl Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org This is a cryptographically signed message in MIME format. --===============3328192696808998268== Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms040309070002020703060603" This is a cryptographically signed message in MIME format. --------------ms040309070002020703060603 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Jon Smirl wrote: > On 6/3/08, Erik Slagter wrote: >> Hi there, >> >> Today I bought this sound device, I was hoping it had the C-Media CM650? >> USB chip which is already supported by alsa (according to the list). >> >> Instead it has a CM6207 inside. >> >> The good news is that it supports USB audio "class" and it's more or less >> usable, some mixer outputs are available (although they're all called >> "speaker") and with some trickery the various outputs can be used. >> >> The other good news is that Sweex supplies the "official" datasheet from >> C-media which I think is quite interesting and may very well be useful to >> resolve the last few issues. > > > Write this up for the Free Linux Driver project. > > http://lwn.net/Articles/276973/ > http://www.linuxdriverproject.org/twiki/bin/view/Main/DriversNeeded > > >> These are the actual issues (so far, I didn't yet test it exhaustively): >> >> - using 2 channel output the sound is garbled; it looks like the "wrong" 2 >> channel alt setting is used (output of /proc/asound/card?/stream0 on >> request), 4/6 channel output is OK though. >> - some high squeeking noise although C-Media claims the IC to be high-end >> (or maybe their definition of high-end differs from mine ;-)) >> - all outputs are labelled "speaker 1" >> - only two outputs have a mute knob, the others cannot be silenced in any >> way, only turned down >> - one of the two outputs with the mute knob doesn't appear to do anything >> (or maybe it's the sp/dif output?) >> - the other (with mute) controls the front output >> - the others (without mute) don't seem to do anything at all >> >> Is this a typical case of (a) bug(s) in the usb audio class driver or >> should I think of "vendor extensions" here? >> >> Would any of the developers have some interest in the datasheet of the chip >> and or any data of this thing? Of course I'd like it very much if the device >> would be fully supported but I can only ask nicely ;-) >> >> _______________________________________________ >> Alsa-devel mailing list >> Alsa-devel@alsa-project.org >> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel BTW, issues 3,4 are my fault: alsamixer calls the mixers all "speaker-1" but if you use amixer, you'll see that this is actually one device with separate mixers for front, side, back, etc. So it's logical it only has one mute knob. --------------ms040309070002020703060603 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJUTCC AwMwggJsoAMCAQICEDGJsD9UPajwBl+GeyaBWA0wDQYJKoZIhvcNAQEFBQAwYjELMAkGA1UE BhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMT 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