Re: [LAU] Sound Devices USBPre2, UAC2 status

From: alexander <axeldenstore@email-addr-hidden>
Date: Mon Jan 07 2013 - 19:27:42 EET

On 04/01/13 21:31, shal@email-addr-hidden wrote:
> Hi,
>
> Some old posts exist about the UAC2 support for the Sound Devices USBPre2 but some problem remains.
> The current status is that this sound card is supported as a USB 1.1 card in high-speed mode.
> But this card is not seen as a Usb Audio Class 2 on Linux. On Mac OS X this card is recognized as UAC2.
>
>
> My principal problem is that the "device descriptor" provided by the card is always a USB1.1 class
> There is two modes of boot for the card (pressing the "1" button, the card is in full speed mode, without pressing in UAC2 mode)
> There is only one difference between these two modes in the lsusb -v : the "bInterval" go to 4 from 1.
>
> This is already view by Clemens on:
> http://lists.linuxaudio.org/pipermail/linux-audio-user/2011-October/081275.html
>
> In this another post, we can seen:
>
> Bernardo Barros wrote:
>> Ok, I reconnected without pressing "1".
>>
>> Bus 002 Device 002: ID 0926:0202
>> Device Descriptor:
>> bNumConfigurations 2
> Strange, I have never 2 on bNumConfigurations ! Somebody can test it on its card ?
> This is perhaps my problem, my card only provides one "Configuration Descriptor".
> The second one is certainly the UAC2 "Configuration Descriptor".
>
>
> The lsusb without 1 pressed : http://pastebin.com/8yjjASv7
> The lsusb with 1 pressed : http://pastebin.com/pGFdjR4K
> The usbmon trace of the insertion of the usbpre2 (without "1") : http://pastebin.com/pySC4Age
>
> This sound card is great, it is very disappointing to not be able to used it with all functionnalities.
>
> I search help in order to debug this problem.
> I am devlopper, I can test kernel patches without problem.
>
> Thank for any idea (or patch).
>
> Olivier
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> Linux-audio-user@email-addr-hidden
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>
I also own this interface, recently it has started to work in uac2 mode,
I still cant raise the samplerate, but it runs.. however, It still runs
alot better in uac1.. when in uac2 jack mysteriously shuts down for no
appearant reason. I run archlinux, allways uptodated with vanilla kernel.

This is when I connect it without pressing 1. eg, uac2
http://pastebin.com/BFJTwXnJ
And as with pressing 1. http://pastebin.com/ZJ1jbPUK
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Received on Mon Jan 7 20:15:06 2013

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