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Sound very low when on kernel 2.6.31-4.22-generic

Asked by Daniel de Souza Telles

After update, the sound output was very low, inaudible for most speakers, so I checked the volume levels, and all of them was if all on max and not muted, gnome-volume-control, alsamixer, pavumeter, so the only option was the kernel, i restarted the system and booted with 2.6.28-14-generic, and believe or not, the sound volume was fine. Another important thing, as my speaker has a sound amplifier, on full volume, i can hear the static noise, and with 2.6.31-4-generic this noise was ok same as with 2.6.28-14-generic. So the problem isn't with the sound card, or with volume control, but with the software amplifier.

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Daniel de Souza Telles
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This question was originally filed as bug #405109.

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Daniel de Souza Telles (danielsouza) said : 		#1
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Daniel de Souza Telles (danielsouza) said : 		#2
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Daniel de Souza Telles (danielsouza) said : 		#3
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Daniel de Souza Telles (danielsouza) said : 		#4
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Daniel de Souza Telles (danielsouza) said : 		#5
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Daniel de Souza Telles (danielsouza) said : 		#6
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Daniel de Souza Telles (danielsouza) said : 		#7
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Daniel de Souza Telles (danielsouza) said : 		#8

Also affects 2.6.31-5-generic.

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Daniel T Chen (crimsun) said : 		#9

Please see your mixer levels:

Simple mixer control 'Master',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 0 [0%] [-46.50dB] [on]
  Front Right: Playback 0 [0%] [-46.50dB] [on]
                   raise this ^^^^^^^^^^^

Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined cswitch cswitch-joined
  Playback channels: Mono
  Capture channels: Mono
  Mono: Playback [on] Capture [off]
          mute this ^^^

Simple mixer control 'VIA DXS',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 0 [0%] [-99999.99dB]
  Front Right: Playback 0 [0%] [-99999.99dB]
                   raise this ^^^^^^^^^^^^^
and do the same for 'VIA DXS',[123]

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Daniel de Souza Telles (danielsouza) said : 		#10

OMFG! Problem solved. When I changed VIA DXS level, the sound level changed too. Converting this to a question. Thanks a lot, you saved my day!

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Daniel de Souza Telles (danielsouza) said : 		#11

As Daniel T Chen showed, this is a obscure alsamixer configuration problem that occurs when updating to Karmic from Jaunty.

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Daniel de Souza Telles (danielsouza) said : 		#12

<email address hidden> questioned this:

"Could you please explain more? How do you install the mixer controls and do you have any suggestions as to what values the numbers should be changed to?"

And I answered this:

"You just need to put "VIA DXS" on the maximum level. You can change it by running "alsamixer" on the terminal, but if you prefer a graphical interface, you can install "gnome-alsamixer" with this command "sudo apt-get install gnome-alsamixer"."