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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Sun, 20 Jul 2008 17:28:10 +0200
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Subject: Re: Logitech USB Headset, mic not detected
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On Sunday 20 July 2008, Norberto Meijome wrote:
> Hi everyone,
>
> I have a USB Logitech headset (it says A-0374A @ the back ). It has a
> microphone , works ok with XP + OSX.
>
> I am running 7.0-STABLE (kernel + world from yesterday).
>
> uaudio0: <Logitech Logitech USB Headset, class 0/0, rev 1.10/10.13, addr 2>
> on uhub0 uaudio0: ignored input endpoint of type adaptive
> uaudio0: audio rev 1.00
> pcm1: <USB Audio> on uaudio0
> uhid0: <Logitech Logitech USB Headset, class 0/0, rev 1.10/10.13, addr 2>
> on uhub0
>
> and /dev/sndstat has
>
> FreeBSD Audio Driver (newpcm: 32bit 2007061600/i386)
> Installed devices:
> pcm0: <Intel 82801F High Definition Audio Controller> at memory 0xb0000000
> irq 16 kld snd_hda [20071129_0050] [MPSAFE] (1p:10v/1r:6v channels duplex
> default) pcm1: <USB Audio> at ? kld snd_uaudio [GIANT] (1p:1v/0r:0v
> channels) mode 1:(output) 2ch, 16/16bit, pcm,
> 8000,11025,22050,44100,48000Hz mode 2:(output) 1ch, 16/16bit, pcm,
> 8000,11025,22050,44100,48000Hz
>
> ( headset = pcm1). It works fine as output, but from what can be seen in
> /dev/sndstat, 2 output modes are detected. I think mode 2 should be input
> (as obviously stereo works fine , so it's mode 1).
>
> Any pointers on how to get this working ?
>

Probably the recording uses ASYNC isochronous type. There are some quirks for 
this.

--HPS