[Bug 416190] [NEW] Pulseaudio produces overdriven audio on Plantronics DA40 adapter

Fri Mar 5 03:48:45 UTC 2010

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In Intrepid and Jaunty, audio sent through the Plantronics DA40 is
distorted if the per-application volume is above around 80%.
Unfortunately, all applications default to 100%.  Audio sent directly to
the ALSA device is not distorted, so this is something happening in
pulseaudio.  I attempted to test this under Karmic, but the volume
sliders behave very differently, with the pavucontrol sliders adjusting
the ALSA "Speaker" mixer, and I was unable to remove the distortion at
all.

The DA40 is a mono device, so perhaps it's a problem with pulse
downmixing stereo audio to mono without reducing the per-channel level,
resulting in clipping.  but I tested with a DA45, which is a similar
mono adapter, and the problem didn't exist.

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Confirmed

** Tags: glucid
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Pulseaudio produces overdriven audio on Plantronics DA40 adapter
https://bugs.edge.launchpad.net/bugs/416190
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