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  • USB sound on Alix running Voyage

    Posted on May 18th, 2011 Johan Adler 1 comment

    I thought that using a USB sound card with Linux would be easy, just plug and play, but I was wrong, it seems. Plug­ging in the Ter­ra­tec Aureon Dual USB (ID: 0ccd:0077) that I bought ren­de­red a pro­mi­sing out­put from dmesg and lsusb, and lsmod sho­wed that even rele­vant modu­les were loa­ded. The pro­blem was that mpd and other pro­grams did not find any way to actu­ally out­put sound to any device. They had the firm belief that my system was lac­king any sound card. Maybe I would need some sound rela­ted pac­ka­ges?

    aptitude install alsa-base alsaplayer alsaplayer-text alsa-utils


    No luck… The mpd con­fi­gu­ra­tion file /etc/mpd.conf see­med mostly con­fu­sing when it came to out­put devices, and the wiki page it refer­red to did not help eit­her. A search with Google on the USB ID was hel­p­ful though, as usual. Some­one with the alias BigRon also had pro­blems with Debian and this Ter­ra­tec USB sound card. The results from his attempts, docu­men­ted with ver­bose out­put, was simi­lar to mine. User bandan’s reply was the begin­ning of the end of my trouble! I had to edit /etc/modprobe.d/alsa-base.conf to com­ment out a line pre­ven­ting USB devices from becoming the first (default) device, sub­sti­tu­ting it for a line with the oppo­site effect.

    ## Keep snd-usb-audio from beeing loaded as first soundcard<br/> #options snd-usb-audio index=-2


    # Fix from http://forum.doozan.com/read.php?2,4119,4166<br/>

    1. Allow snd-usb-audio to be loaded as first soundcard options snd-usb-audio index=0


      Now I was at least able to get alsa­mixer to ack­now­ledge the mere existence of a sound rela­ted device, but alas it chose an input only device (most likely my Logi­tech webcam with microp­hone) as the default device even though it cal­led the Ter­ra­tec one default by name. Luc­kily for me the just men­tio­ned forum thread linked to a more sub­stan­tial thread descri­bing the pro­blem in more depth. I added myself and the mpd user to the audio group, to make sure that there would not be any pro­blems with per­mis­sions regar­ding the devices

      addgroup jadler audio addgroup mpd audio


      I was still unable to play anyt­hing (wit­hout expli­citly cho­sing what Alsa refers to as sound card 1). So I kept try­ing the stuff that had worked for the per­son repor­ting in the forum, cre­a­ting an /etc/asound.conf file with basi­cally the same con­tent as sug­ges­ted in the last thread refer­red to above, but chan­ging all refe­rences to hw:0 to hw:1, and from card 0 to card 1. Now mplayer works, but I still can’t get mpd to do its thing.

      Alix, Datorer, Embedded, English, Linux , , , , , , , ,

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