From owner-freebsd-usb@FreeBSD.ORG  Wed Feb  8 15:35:59 2012
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From: Hans Petter Selasky <hselasky@c2i.net>
To: Purushotham Nayak <nayak_purushotham@yahoo.com>
Date: Wed, 8 Feb 2012 16:34:04 +0100
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Cc: "freebsd-usb@freebsd.org" <freebsd-usb@freebsd.org>
Subject: Re: Bose USB Audio No Playback
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On Wednesday 08 February 2012 00:59:12 Purushotham Nayak wrote:
> Hi Hans,
> 
> 
> When I just run usbconfig I get
> ugen0.2: <Bose USB Audio Bose Corporation> at usbus0, cfg=0 md=HOST
> spd=FULL (12Mbps) pwr=ON
> 
>  I ran,
> usbconfig -d ugen0.2  dump_device_desc dump_curr_config_desc
> I've attached the output with this e-mail.
> 
> I pulled out the bose usb and ran
> sysctl hw.usb.uaudio.debug=15
> and then plugged back in and it's still the same in dmesg. It says No
> Playback.  Interesting my mouse stopped working when I did this.

Hi,

Try this command:

sysctl hw.usb.uaudio.default_channels=6

Then replug your device.

Does it work?

You can also set this in:

/boot/loader.conf

I think the problem is that that your device is having a lot of channels, and 
should really be using High Speed USB. The device might not work correctly 
when connected through a High Speed HUB. Connect it directly to your PC/MAC!

Reference:
/sys/dev/sound/usb/uaudio.c

                switch (usbd_get_speed(udev)) {
                case USB_SPEED_LOW:
                case USB_SPEED_FULL:
                        /*
                         * Due to high bandwidth usage and problems
                         * with HIGH-speed split transactions we
                         * disable surround setups on FULL-speed USB
                         * by default
                         */
                        channels = 2;
                        break;
                default:
                        channels = 16;
                        break;
                }

--HPS