Re: Focusrite VRM Box

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Please, never(!) drop any addresses from Cc: - always use "reply to all".


On Thu, Sep 15, 2011 at 11:40 AM, Fabio Tonti <ftonti@xxxxxxxxx> wrote:
> On Thu, Sep 15, 2011 at 11:32 AM, Daniel Mack <zonque@xxxxxxxxx> wrote:
>> It's perfectly possible that the device does not expose any controls.
>> Which controls did you expect?
>
> Volume Control (as in Windows). And with the windows driver you also
> get a utility to choose the emulated environment and emulated
> loudspeaker type. This should simply be some flags for the device, at
> least I think it should be like that.

That is all purely implemented in their proprietary Windows software
stack. Under Linux, you need something like PulseAudio which does
volume control in software, too.

>>> Also, the LED on the device is not on (as it is in Windows).
>>
>> What does this LED signal?
> It's on when the device is operative.
>

[...]

>> Which problem do you actually see? Does sound streaming work for you?
> No it does not. Is there any way to test this that I don't know of?
> And what about that "interrupt error" that dmesg tells? Thanks in
> advance.

Try "pasuspender aplay -D plughw:<shortname-of-your-card-here>
test.wav". Check for the appropriate short name of your device in
/proc/asound/cards.

If that doesn't work, the Windows driver most probably does some
proprietary initialization of the hardware using vendor-specific
requests (which also switch on the LED). If that's the case, you wound
need to sniff these commands using usbsnoop [*]. Once we know which
commands are needed, they can easily be added to the driver as a
quirk.


Daniel

[*] http://sourceforge.net/projects/usbsnoop/

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