[Bug 22228] New: no sound output on USB phone (snd_usb_audio)

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Ubuntu | linux

           Summary: no sound output on USB phone (snd_usb_audio)
           Product: Ubuntu
           Version: unspecified
          Platform: i386
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: linux
        AssignedTo: ben.collins at ubuntu.com
        ReportedBy: andrew+ubuntu at jorgensenfamily.us
         QAContact: kernel-bugs at lists.ubuntu.com


I have a usb phone which I cannot make play any kind of sound.  It has specific
requirements, so I have already configured it like so (.asoundrc):

pcm.voip {
        type plug
        slave {
                pcm "hw:1,0"
                format S16_LE
                channels 1
                rate 8000
        }
}

(Why doesn't alsa know to do this on it's own like it supposedly knows to do
dmix?  It knows that the device only accepts these settings!)

And I attempt to play a file to it using aplay -D voip /path/to/some.wav which
the driver claims is okay.  When doing this if I look at
/proc/asound/card1/stream0 it says that it's playing, but no sound comes out of
the device.  alsamixer shows two mono channels (PCM and PCM 1) which is odd by
itself, since other parts of alsa tell me I have only one channel that I can
play to.  Another odd thing about alsamixer is that when I turn up the volume
(it is around 70% at start) it mutes it around 80%.  It seems clear that
something is messed up here.

I've tried it on Breezy and Dapper on ehci and uhci interfaces.  I've even
tweaked the few module parameters that snd_usb_audio has.  No change except that
one of the settings of nrpacks I tried made it so that I could not change the
volume on "PCM" with alsamixer.

Windows shows only one out and one in and works perfectly with built-in
usb-audio drivers (only saying so to rule out "your device is broken").  The
manufacturer has a linux "driver" (an application that reads the hiddev data)
built for Fedora Core 3.  The author of the yealink input driver (now included
in dapper, thanks guys!) says that his works fine.  I have been able to capture
audio using arecord -D hw:1,0 -f S16_LE -r 8000 -c 1 test.wav and that seems to
work fine (I can play it out my regular sound card).

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