Rustling noise on phonecalls

Ben Wong at
Thu Jul 9 06:54:15 CEST 2009

Mickey: It seems a very bad idea to default to maximum volume if it
causes distortion.  I'm not sure yet that that's the sole audio
problem in SHR-unstable, but I can say that when I turned the speaker
volume down to what it was in SHR-testing (68%), I was understood
perfectly, for the first time, by Google's voice recognition

For anyone wondering how to use D-Bus to set the volume to 68%, you
can do it by cutting and pasting this line:

  mdbus -s org.freesmartphone.ogsmd /org/freesmartphone/GSM/Device
org.freesmartphone.GSM.Device.SetSpeakerVolume 68

And this line will show you the current volume:

  mdbus -s org.freesmartphone.ogsmd /org/freesmartphone/GSM/Device

Please experiment with different values by changing the volume during
a call.  I'm interested to know what values work the best for you all.
 And does 100% actually work for anybody without distortion?


On Tue, Jul 7, 2009 at 10:38 PM, Michael 'Mickey'
Lauer<mickey at> wrote:
> FWIW, against my personal experience (where this setting lead to
> suboptimal results), people have forced me to uplevel the speaker volume
> in the phone to the maximum in ogsmd. It's very possible that this
> contributes to the distortion. Try lowering it, e.g. via
> org.freesmartphone.GSM.Device.SetSpeakerVolume( percentage ).
> :M:
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> Openmoko community mailing list
> community at

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