Dragonfly USB DAC under 9.1-RELEASE

Craig Leres leres at ee.lbl.gov
Tue Apr 23 17:47:26 UTC 2013

On 04/23/13 06:18, Lev Serebryakov wrote:
>  Dragonfly DAC is async DAC, not adaptive one, which use async mode for
> isochronious transfers (not very common mode, but standard one for
> sure, since USB 1.1) and local clock source for DAC itself.

I guess the audio defects I was hearing with the 9.1-RELEASE dev/sound
subsystem point to a bug with sound-related async-isochronous transfers.

>  Also, it squeeze maximum from USB 1.1 (96/24) without being USB 2.0
> audio device, as far as I know, but I may be wrong here.

It's a full speed device:

    hot 5 % usbconfig -d 2.2
    ugen2.2: <AudioQuest DragonFly AudioQuest inc.> at usbus2, cfg=0
md=HOST spd=FULL (12Mbps) pwr=ON


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