[alsa-devel] [GIT PULL] dummy: allow disabling mixer controls

[Clemens Ladisch]

Raymond Yau wrote:
> 2012-10-21 上午6:11 於 "Clemens Ladisch" <clemens at ladisch.de> 寫道：
>> Quite a few mixer applications do not handle deactivated controls
>> correctly.
>
> what is the meaning of deactivated control ?

A control where writes do not have an (immediate) effect.

> amixer still can change the value of the deactivated cd volume control if
> write access is no disabled

Yes, when write access is enabled, the control can be written to.
This is necessary for "alsactl (re)store".

Alsamixer displays such controls as gray and read-only because changing
them would not make sense at the moment, but allowing changes would
actually be possible (if confusing).


Regards,
Clemens