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

On Wed, 17.02.10 10:04, Jaroslav Kysela (perex@perex.cz) wrote:

The second question is if the represented dB range and scale reported from the driver (hardware and audio chip datasheets) really matches the hardware and how we can measure these values. I suspect a lot of trouble here, because the analog parts of soundcards might have strange curves - it's probably thing you deal with in PA now.

Yes, that is indeed the problem.

For PA I don't care whether the dB curve reported by ALSA might be shifted relative to some reference level, what matters is that otherwise the curve reflects properly how volume increases with higher discrete volume settings.

Lennart