[alsa-devel] Mixer volume/decibel mapping

[Sebastian H.]

Am 08.06.2010 17:31, schrieb Raymond Yau:
> 2010/6/8 Sebastian Holtermann <sebholt at web.de>
> 
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>> Am 08.06.2010 03:03, schrieb Raymond Yau:
>>
>>>
>>>
>>> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4883
>>>
>>> Pekka Lampila reported that when he set -40dB and only get back -9999999
>> by
>>> his program alsa_mixer_test.c
>>>
>>> I don't have emu10k1 so don't know whether this is a bug of alsa-lib or
>> not
>>
>> I also get a big jump from -39.60dB to -99999.99 dB for some emu10k1
>> sliders when I move them to the minimum although their advertised
>> minimum is -40dB. This looks like a way to express log ( 0 ).
>>
>>
> it seem that only "Wave Master" has mute switch , the other "Wave Rear" ,
> "Wave Center/Lfe" and "Wave side" only have volume control
> 
> Have you try the patch : emu10k1: allow high-resolution mixer controls
> 
> 
> http://git.alsa-project.org/?p=alsa-kernel.git;a=commit;h=4daf7a0c0b3dd3c2e2ec829ecee8608d04d67773

alsa-compile.sh did not work out of the box because of
"Cannot install kernel sources for unsupported distribution Debian"
and I don't have the time to dig deeper into kernel module compiling
right now.