Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: alsa-driver (Ubuntu) Status: New => Confirmed
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1227148/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp