[alsa-devel] Verifying mixer dB data/Invalid dB data from USB cards, especially Aureon 5.1 MkII

Mark Brown broonie at opensource.wolfsonmicro.com
Wed Feb 17 14:32:52 CET 2010

On Wed, Feb 17, 2010 at 02:15:48PM +0100, Lennart Poettering wrote:

> I wonder if we could harvest this in some way from the Windows
> drivers? Does Windows care about the dB data at all? Maybe one could
> extract this information from their .inf files or so, if they store it
> there?

It could well be, for this sort of stuff grovelling around in the MSDN
driver kit documentation will normally turn something up.

> I wonder where they get that data from and what they do with broken
> hardware like the Aureon... Now I wished I had access to a Windows
> machine to figure that out...

IME this is dealt with by the manufacturer providing a driver, a device
specific driver will bind in preference to a class driver and with
Windows it's much more normal to ship a device specific driver along
with the device.  I've no knowledge of Windows audio drivers, though.

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