Raymond, I have attached verbose PA log of microphone
plugging/unplugging. It does not seem to contain valuable info though.
Checking volume levels with alsamixer lead to interesting results. It
turns out that I have common 'Capture' control for both source ports and
separate controls 'Internal Mic Boost' and 'Mic Boost'. Source volume is
a sum of 'Capture' and corresponding 'Boost'.
PA prefers increasing boost volume when it sets source volume, so boost
goes up to 100% even at 28% source volume.
So I ended up with one of the boost controls maximized when I was making
my records. By switching to 'wrong' port I have moved boost to wrong
control, leaving current port without boost and thus without noise.
To illustrate this behavior a dumped amixer control levels for source
volumes from 1% to 102% with following script
for v in {1..102}; do
echo "Setting volume=$v%"
pactl set-source-volume 1 $v%
amixer scontents | sed -n "/'Capture'\|'Internal Mic Boost'/,/^ Front
Right/p"
echo
done > volume_amixer.log
You can check log of PulseAudio (volume_pulse.log) while performing this
test as well.
--------------------------
Finally:
It seems wrong, that PulseAudio prefers to increase 'Boost' control over
'Capture' control. 'Boost' should not be increased from zero value if
increasing 'Capture' control is enough to get overall requested volume.
** Attachment added: "volume_amixer.log"
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1085402/+attachment/3449877/+files/volume_amixer.log
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https://bugs.launchpad.net/bugs/1085402
Title:
Wrong auto selection of microphone input
Status in “pulseaudio” package in Ubuntu:
New
Bug description:
Om my notebook PulseAudio detects 2 ports on embedded sound card:
1) analog-input-microphone-internal
2) analog-input-microphone
PulseAudio module "module-switch-on-port-available" chooses as default
port #2 after external microphone is attached and switches back to
port #1 after external mike removal.
This behavior seems right.
However, if I record sound with auto selected port, audio quality is
very poor. There is loud noise in background. But if I switch to
"wrong" port audio quality becomes great. E.g. I have to manually
select "analog-input-microphone-internal" port when I attach external
mike and vice versa.
Example of record:
http://self-perfection.homeip.net/files/2012/external_ru.flac (652 KiB)
This record is made via headset microphone. During first half of record
source port analog-input-microphone was selected then i switched to port
analog-input-microphone-internal.
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: pulseaudio 1:2.1-0ubuntu4
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: self 2150 F.... pulseaudio
self 2255 F.... xfce4-volumed
Date: Sat Dec 1 16:34:31 2012
InstallationDate: Installed on 2012-07-01 (152 days ago)
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MarkForUpload: True
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to quantal on 2012-10-21 (40 days ago)
dmi.bios.date: 04/03/2012
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 06QB
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 300E4Z/300E5Z/300E7Z
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias:
dmi:bvnPhoenixTechnologiesLtd.:bvr06QB:bd04/03/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn300E4Z/300E5Z/300E7Z:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rn300E4Z/300E5Z/300E7Z:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.name: 300E4Z/300E5Z/300E7Z
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
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