This bug was fixed in the package pulseaudio - 1:1.1-0ubuntu15.2
---------------
pulseaudio (1:1.1-0ubuntu15.2) precise-proposed; urgency=low
* 0622-Front-headphone.patch:
Fix "Front headphone Jack" not being picked up by PulseAudio
(LP: #1020471)
* 0623-resampler-Fix-volume-on-downmix-to-mono.patch:
Fix clipping audio on downmix to mono (LP: #416190)
* 01PulseAudio:
Don't mute Bluetooth devices on suspend, they might remain muted
after resume (LP: #1038084)
* 0624-alsa-mixer-Add-Phantom-Jack-support.patch:
This will allow us to work better with devices on the backport
stack by making use of a Quantal kernel feature (if it exists).
(LP: #946232)
* 0625-alsa-mixer-Add-a-few-more-machines-to-internal-mic-w.patch:
Add a few more machines to the internal mic whitelist
(LP: #1076840) (LP: #1073420)
-- David Henningsson <[email protected]> Fri, 09 Nov 2012
12:31:19 +0100
** Changed in: pulseaudio (Ubuntu Precise)
Status: Fix Committed => Fix Released
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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 Released
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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