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

[Mark Brown]

On Tue, Feb 16, 2010 at 03:32:01PM +0100, Lennart Poettering wrote:
> On Tue, 16.02.10 09:24, Jaroslav Kysela (perex at perex.cz) wrote:

> > Line: 0dB..47.81dB		# seems correct -47.81dB..0dB
> > Line Capture: -0.18dB..23.81dB	# seems correct
> > -17.81dB..6.18dB

> Hmm, how did you choose where to put 0dB?

The Line one looks like someone got attenuation and gain confused, which
is a fairly common mistake for people to make when copying information
from one place to another.  Possibly a similar thing going on with the
Line Capture control, plus a fixed 6dB gain (which may well be a
separate amp...).