2012-10-21 下午7:13 於 "Clemens Ladisch" clemens@ladisch.de 寫道：
Raymond Yau wrote:
2012-10-21 上午6:11 於 "Clemens Ladisch" clemens@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.
why do you not implement this kind of control by disable/enable the write access ?
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".
if the control can be write when the driver is loaded, the write access of the control can be disable/enable instead of using active/inactive
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).
alsamixer can also display non writable control in different color