On Mon, 27 Jun 2011 22:56:35 -0700 John Magolske <listm...@b79.net> wrote:
> I just bought a FiiO E7 USB headphone amplifier. I've read that it > works fine under Linux [1], but have not had any luck getting sound > out of it. > > When running alsamixer I see "USB Audio DAC" come up when pressing > the F6 "Select sound card". Selecting that and adjusting the volume > accomplishes nothing...no sound out of the headphones pugged into the > device (whereas the headphone jack on my x200s ThinkPad works fine). > I've also unmuted everything in alsamixer. > > Any suggestions regarding how to troubleshoot this? As I understand it (and I'm no expert): when your ALSA system has multiple sound devices, they'll all show up in the mixers, and applications are free to choose any one they wish. I have no idea if there's some way to set a system default (perhaps at the Desktop Environment level?) - I've always just configured this on an application by application basis. So using mplayer, I have these two lines in my .mplayer/config: #ao=alsa:device=hw=1 #mixer=/dev/mixer1 The internal sound card is hw=0 ; when my external USB sound device is plugged in, I uncomment these lines, telling mplayer to use the external device, and when it isn't, I comment them out, causing mplayer to use the internal one. There certainly ought to be some more elegant way to automate this, but as I said, I'm no expert. The second line instructs mplayer to use the second mixer device (the first is /dev/mixer), which corresponds to the external sound device. Without this line, adjusting the volume in mplayer will send commands to the default mixer, and the USB sound volume will remain untouched. There certainly ought to be some way to link the device and mixer, i.e., to instruct mplayer to automatically use the mixer that corresponds to the selected sound device, but once again, I have no idea how to do this. Configuration instructions will presumably differ depending on your sound application. Hth, Celejar -- foffl.sourceforge.net - Feeds OFFLine, an offline RSS/Atom aggregator mailmin.sourceforge.net - remote access via secure (OpenPGP) email ssuds.sourceforge.net - A Simple Sudoku Solver and Generator -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20110629142118.c07e2b1c.cele...@gmail.com
