Hello Joel, or anyone else affected,

Accepted pulseaudio into precise-proposed. The package will build now
and be available at
http://launchpad.net/ubuntu/+source/pulseaudio/1:1.1-0ubuntu15.2 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please change the bug tag from
verification-needed to verification-done.  If it does not, change the
tag to verification-failed.  In either case, details of your testing
will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Tags added: verification-needed

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/416190

Title:
  Pulseaudio produces overdriven audio on mono downmix (e g to
  Plantronics DA40 adapter)

Status in “pulseaudio” package in Ubuntu:
  Fix Released
Status in “pulseaudio” source package in Precise:
  Fix Committed

Bug description:
  [SRU Justification]
  Impact: See below. But in short, distorted sound when on an analog-mono 
profile. Most soundcards support analog-stereo only, but for some hardware, 
this is a problem.

  Testcase: Using hardware that supports analog-mono profile, play back audio, 
source
  material at sufficient volume. If this bug is fixed, there is no distortion.

  Regression potential: Can't think of any, and if so, it should only
  affect downmixing to mono, which is unusual anyway.

  
  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.

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