2

I did try the both the solutions given here, however it fails with the following error.

 m = alsaaudio.Mixer('PCM') alsaaudio.ALSAAudioError: Unable to find mixer control 'PCM',0

I'm assuming that my mixer control is not PCM. When I change the volume on my laptop, I use alsamixer, and where I select the sound card to be HDA Intel PCH. I'm using the Realtek ALC3235.

Here is the result from my amixer

Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on] Simple mixer control 'IEC958',1 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on] Simple mixer control 'IEC958',2 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on]

How should I fix this?

After the change from CL.

This is what my amixer looks like.. maybe this is of any help

Simple mixer control 'Master',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 87 Mono: Playback 75 [86%] [-9.00dB] [on] Simple mixer control 'Headphone',0 Capabilities: pswitch Playback channels: Front Left - Front Right Mono: Front Left: Playback [off] Front Right: Playback [off] Simple mixer control 'Headphone+LO',0 Capabilities: pvolume Playback channels: Front Left - Front Right Limits: Playback 0 - 87 Mono: Front Left: Playback 0 [0%] [-65.25dB] Front Right: Playback 0 [0%] [-65.25dB] Simple mixer control 'Speaker',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 87 Mono: Front Left: Playback 87 [100%] [0.00dB] [on] Front Right: Playback 87 [100%] [0.00dB] [on] Simple mixer control 'PCM',0 Capabilities: pvolume Playback channels: Front Left - Front Right Limits: Playback 0 - 255 Mono: Front Left: Playback 255 [100%] [0.00dB] Front Right: Playback 255 [100%] [0.00dB] Simple mixer control 'Line Out',0 Capabilities: pswitch Playback channels: Front Left - Front Right Mono: Front Left: Playback [on] Front Right: Playback [on] Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 63 Front Left: Capture 52 [83%] [21.75dB] [on] Front Right: Capture 52 [83%] [21.75dB] [on] Simple mixer control 'Auto-Mute Mode',0 Capabilities: enum Items: 'Disabled' 'Speaker Only' 'Line Out+Speaker' Item0: 'Line Out+Speaker' Simple mixer control 'Dock Mic',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Mono Mono: Capture [off] Simple mixer control 'Dock Mic Boost',0 Capabilities: volume Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 3 Front Left: 0 [0%] [0.00dB] Front Right: 0 [0%] [0.00dB] Simple mixer control 'Headset Mic',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Mono Mono: Capture [off] Simple mixer control 'Headset Mic Boost',0 Capabilities: volume Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 3 Front Left: 0 [0%] [0.00dB] Front Right: 0 [0%] [0.00dB] Simple mixer control 'Internal Mic',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Mono Mono: Capture [on] Simple mixer control 'Internal Mic Boost',0 Capabilities: volume Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 3 Front Left: 0 [0%] [0.00dB] Front Right: 0 [0%] [0.00dB]
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2
  • Setting the Mixer to IEC958 did the job, but that does not help setting the volume :-).. neither is it the correct card. Commented Oct 8, 2016 at 16:39
  • Do you have an update on this? I am not sure how to get this working.. Commented Oct 11, 2016 at 12:28

2 Answers 2

Reset to default
0

alsaaudio goes to the default sound card. By default, this is the first card, which in your case appears to be the HDMI output.

To make the second card the default, add the following to /etc/asound.conf or your ~/.asoundrc:

defaults.ctl.card 1 defaults.pcm.card 1
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1
  • It still gives 0 with getvolume() when it is set to 80 Commented Oct 8, 2016 at 16:57
0

From your amixer result, this could work: 

m = alsaaudio.Mixer(1,'PCM')

The "1" is for the 2nd sound device (HDA Intel).

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5
  • No, because PCM does not exist.. IEC958 is the only option. and it exits with the following errorTypeError: argument 1 must be string, not int Commented Oct 9, 2016 at 13:04
  • 1
    Eitherway, it should be alsaaudio.Mixer(control='IE958', id=x) where x is a positive integer. Even this does not help. wonder what is missing Commented Oct 9, 2016 at 13:07
  • Does this works (1 is the index for 2nd device , try also 0 if not ok ) amixer -c 1 set PCM 50 Commented Oct 9, 2016 at 14:06
  • Yes, sure. the PCM volume is controlled. but that is not effecting the output of m.getvolume() Commented Oct 9, 2016 at 14:55
  • The issue is, if the parameter for control is passed as anything other than IEC958.. it fails with an error Commented Oct 9, 2016 at 15:15

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