Page locked

This page is currently locked for editing by another user. You have to wait until this user finishes editing or the lock expires.

Currently locked by: 172.30.0.1,194.15.36.207
Lock expires at: 2024/05/05 16:24 (15 min)

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.

====== AC100 sound mixer ======
These netbooks use ALC5632 audio codec plus mixer IC which has quite some amount of knobs and switches. Most of them are available for direct manipulation with ''alsamixer'', ''GNOME Volume Control'' and other applications that interact with ALSA mixers.

===== Analog Audio Mixer Path =====
Fear not, here's the diagram from the datasheet that allows one to make sense out of all those confusing opportunities:

{{:alc5632_mixer_path.png|}}

Understanding it doesn't require any special knowledge, here's a short legend:
  * ''DAC'' is [[http://en.wikipedia.org/wiki/Digital-to-analog_converter|Digital to Analog Converter]], ''DACs'' module gets digital stereo signal via ''I2S'' bus from the CPU (''VoiceDAC'' module is left unconnected an ac100)
  * ''ADC'' does the reverse and can be used to convert sound from inputs to digital form which is then sent over ''I2S'' to the CPU
  * DMIC is a digital microphone, connected to special pins of the integrated webcam
  * A triangle on the diagram means a sound amplifier
  * A square marked ''Vol'' is an [[http://en.wikipedia.org/wiki/Attenuator_(electronics)|attenuator]] that a user can tweak to reduce the volume of the signal
  * A square with ''M'' is a mute switch
  * A circle with sigma is a module that mixes all the inputs together
  * A trapezoid is a mux, a module that allows the user to select only one of the inputs to be connected to the output

===== Common usage scenarious =====
Here ALSA control names are used, if you're using alsamixer or other similar software you will not see "Playback" or "Mux" in the control names, that is normal.
==== Stereo playback on integrated speakers ====
Should be enabled:
  * ''DACL2HP Playback Switch''
  * ''DACR2HP Playback Switch''
  * ''Int Spk''
Should be set:
  * ''SpeakerOut Mux'' to ''HPOut Mix''
  * ''SpeakerOut N Mux'' to ''RP/+R''
Master and speaker playbacks should be unmuted and set to the desired level.

Proper mono sound via MONO mixer or Speaker mixer is impossible to produce on unmodified hardware, see [[hw_problems#reversed_polarity_of_one_of_the_integrated_speakers]] for details. Luckily most usage scenarios do not require that anyway. You can swap polarity of connection of one of the speakers but then ''RN/-R'' would need to be used for the stereo output.