Raspbian: "amixer: Unable to find simple control 'Master',0"

[peter_b]

[PROBLEM]
On Raspbian Stretch, I'm trying to adjust the volume on the shell/commandline, using "amixer", but get the error message:

amixer: Unable to find simple control 'Master',0

[SOLUTION]
Thanks to post on github by user R00t8ug:

okie, for raspberry pi user douban.py inside find "Master" > "PCM" fix the bug.

Works.

Properly returns:

Code: Select all

Simple mixer control 'PCM',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono
  Limits: Playback -10239 - 400
  Mono: Playback -2790 [70%] [-27.90dB] [on]