Re: Benchmark Media DAC2 HGC iffy USB 2.0 audio

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Hi Jeff,

On 10.07.2013 06:59, Jeff S wrote:
> Hello, I'm having difficulties getting my brand-new Benchmark DAC2
> HGC to work reliably. I think it's supposed to be a USB Audio Class
> device, and it runs w/o additional drivers on Mac OS X just fine, and
> under Windows using Benchmark Media's drivers for USB 2.0 audio.

According to the descriptor dump, it is.

> But under Linux, it doesn't seem to work at all in USB 1.0 mode:

Is there a hardware switch to select one of the two modes?

> Seems to be recognized OK but shows no output device in the Gnome
> sound configuration utility.

What does 'cat /proc/asound/cards', 'aplay -l' and 'arecord -l' say?

> In USB 2.0 mode, it's iffy, often briefly showing up as a USB 1.0
> device,

You mean UAC1 I take it? What makes you believe it's coming in that mode?

> then disappearing from the Gnome sound configuration tool
> altogether. It behaves similarly in Windows, initially showing up as
> a 1.0 device, disappearing, but reappears as a 2.0 device a few
> seconds later, and under Windows, it works fine every time. Sometimes
> if I plug the DAC into my Windows notebook first, then plug it into
> the Linux box, the DAC will show up as a USB 2.0 device, and will
> work great, at least until I power it all down.

It might be worth looking at a USB trace during the Windows driver
start-up. Maybe they send some vendor-specific magic, which we could
easily replicate in Linux. But you say that you didn't install
*anything* under OS X? Not even some sort of configuration tool?

> Currently using Linux Mint 15 (Mate) 64-bit w/Kernel 3.8.0 and
> libasound2 1.0.25-4ubuntu3.1.
> 
> Results of lsusb -v in both USB 1 and 2 modes are here: 
> https://www.dropbox.com/sh/eq9ed280i1kka4a/hSsAYhyRJ7

Please also post the kernel messages generated by the driver probe. An
easy way to do this is running 'sudo dmesg -c' before and some seconds
after a device hotplug.


Best,
Daniel

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