At Thu, 6 Jun 2013 10:34:36 +0000, Lin, Mengdong wrote:
-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Thursday, June 06, 2013 5:02 PM
At Thu, 6 Jun 2013 05:39:00 +0000, Lin, Mengdong wrote:
And could you give me some info about the relationship of "Master playback
switch", "Headphone Playback Switch" and "Speaker Playback switch"?
I observed a close binding between "Master playback switch" and "Headphone
Playback Switch": if I turn off one, then both will be turned off. It looks strange.
But the "Speaker Playback Switch" is independent from "Master playback
switch": It can be turn on/off without affecting the "Master".
Both "Speaker Playback Switch" and "Headphone Playback Switch" are
implemented by a output pin, why "Master" seems to be tied to "Headphone"?
Master is master. If it's turned off, all belongings will be off. That is, if Master is muted, both speaker and headphone outputs are muted no matter what Speaker or Headphone element is set.
Thanks for clarification, Takashi!
Is this master-slave logic implemented in ALSA driver or lib?
It's purely in the driver.
Takashi