On an Acer Aspire 5810TG running Ubuntu 18.04 with latest 5.3 kernel. HDA Intel. ALC269 Analog. Pulseaudio was monitoring minimal sound from internal mic with both channels on, but ok with either left or right off. Audacity and Gnome Sound Recorder had no issues. Audacity showed two phase inverted channels. Same issues as above re Skype and Hangouts and same workarounds worked. External mono plug in mic - no problem.
Same problem on same machine with Debian 10 Buster. Tried remapping the Pulseaudio stereo channels to mono which allowed even output through both speakers. For instructions see: https://wiki.archlinux.org/index.php/PulseAudio/Troubleshooting #No_microphone_on_Steam_or_Skype_with_enable-remixing_=_no After this, Pulseaudio still has to have one internal mic channel off to function. However output is now through both speakers instead of one. In Ubuntu, Audacity shows two channels with same phase. In Debian, Audacity shows one mono channel. Same difference through the speakers. I believe this is still a bug as Pulseaudio cannot produce output from with a phase inverted stereo internal mic as Audacity and Sound recorder can. Best regards, Your bleeding user -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1002978 Title: [meta-bug] Inverted Internal microphone (phase inversion) Status in alsa-driver package in Ubuntu: Expired Bug description: This is a metabug for all machines that are having phase inverted internal microphones. If your internal mic is either completely silent (no signal), or you can possibly pick a very small sound, with much background noise, even though you have set gain to maximum, there is something you could try. Install the pavucontrol application, start it and go to the "Input Devices" tab. Unlock the channels (there is a keylock icon), then mute the right channel while keeping the left channel at the volume you want. If the internal mic is now working correctly, you have an inverted internal mic, so that your right channel cancels out the left one. (If you're not running PulseAudio, you can try doing the same through AlsaMixer instead (see https://wiki.ubuntu.com/Audio/Alsamixer ), try changing "Capture" level or "Internal Mic" or "Internal Mic Boost" using the Q,E,Z,C keys.) If so, please file a separate bug against the alsa-driver for your issue, make sure hardware info gets attached to it (either alsa-info as per https://wiki.ubuntu.com/Audio/AlsaInfo or the standard ones that follows when you do "ubuntu-bug alsa-driver" ), then write a comment in this bug, with your machine name and a pointer to the other bug. As time permits, I'll try to work on fixing them for the next Ubuntu release. Thanks! -- David Henningsson To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1002978/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
