[alsa-devel] alsactl adds volume controls?

Colin Guthrie gmane at colin.guthr.ie
Fri Oct 1 10:19:02 CEST 2010

'Twas brillig, and Clemens Ladisch at 01/10/10 07:44 did gyre and gimble:
> Takashi Iwai wrote:
>> Mark Brown wrote:
>>> On Thu, Sep 30, 2010 at 04:09:56PM +0100, Colin Guthrie wrote:
>>>> *shouldn't* use them, but at present it does and they *are* active and
>>>> used, so it's not an issue for me), the problem is rather one of setting
>>>> Master (not PCM) to 0% aka -46.5dB causes some kind of auto-mute that
>>>> cuts off all sound. It shouldn't do that.
>>> Is this perhaps just an error in the TLV information - should it be
>>> flagging that the minimim gain is mute but isn't?
>> There is no clear (or consistent) definition in HD-audio codec, I guess.
> The HDA spec is quite clear that muting is done only with the mute bit.

Good :)

>> Some chips do mute at 0 and some not.
> Those that do are violating the specification.
> But we have to support them anyway.
> Colin, please tell us the IDs of your codec so that we can add a TLV
> workaround to the driver.

I presume the alsa-info.sh output is sufficient here?


snd_hda_intel   : Intel Corporation|82801G (ICH7 Family) High Definition
Audio Controller (vendor:8086 device:27d8 subv:1028 subd:01bd) (rev: 01)

Many thanks



Colin Guthrie

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