Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: alsa-driver (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1227148
Title:
System76 galu1: Inverted Internal microphone (phase inversion)
Status in “alsa-driver” package in Ubuntu:
Confirmed
Bug description:
As per this meta-bug:
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1002978
The System76 Galago UltraPro (galu1) has inverted stereo mics. We
didn't catch this in our testing as (interestingly) there is no
cancellation effect when the mic is set at the default gain level of
"Unamplified", and apparently no one happened to turn the gain up
during testing =)
Another interesting thing is that there is likewise no cancellation
effect up to maybe 15% gain (by slider position in UI). Up to this max
working gain level, the audio sounds perfect. But if I increase the
gain just one tick more (right arrow while gain slider is focused),
there is then complete cancellation... all you get are weird popping
sounds now and then.
However, if I put the gain at 100% and then turn off either the right
or left channel in alsamixer, the audio sounds fine, which suggests
typical phase inversion. But the fact that it works at lower volume
levels doesn't really make sense, so I expect there is some other
quirkiness that might need to be addressed also.
I'll do more digging.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-30.44-generic 3.8.13.6
Uname: Linux 3.8.0-30-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: jderose 1542 F.... pulseaudio
/dev/snd/pcmC1D0c: jderose 1542 F...m pulseaudio
/dev/snd/controlC0: jderose 1542 F.... pulseaudio
Date: Wed Sep 18 07:32:08 2013
InstallationDate: Installed on 2013-09-18 (0 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: alsa-driver
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/09/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.5
dmi.board.asset.tag: Tag 12345
dmi.board.name: Galago UltraPro
dmi.board.vendor: System76, Inc.
dmi.board.version: galu1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: System76, Inc,
dmi.chassis.version: galu1
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd07/09/2013:svnSystem76,Inc.:pnGalagoUltraPro:pvrgalu1:rvnSystem76,Inc.:rnGalagoUltraPro:rvrgalu1:cvnSystem76,Inc,:ct9:cvrgalu1:
dmi.product.name: Galago UltraPro
dmi.product.version: galu1
dmi.sys.vendor: System76, Inc.
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