Created attachment 6673 [details] ALSA info The internal microphone of Lenovo G50-30 is affected by Ubuntu bug 1002978, see https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1002978 and links from this bug to specific notebooks bugs. OS: ALT Linux Simply, updated to the current P7 branch. Kernel: 4.1.19-un-def-alt0.M70P.1 #1 SMP PREEMPT Wed Mar 9 11:02:42 UTC 2016 x86_64 GNU/Linux (the same must be true for kernel 4.4.5-un-def-alt1 from Sisyphus). ALSA info applied. This patch (after David Henningsson) fixes this behaviour: Add a quirk to fix inverted internal stereo mic channel of Lenovo G50-30. Signed-off-by: Andrey Liakhovets <liakh@dol.ru> diff -Napru a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c --- a/sound/pci/hda/patch_conexant.c 2016-03-13 14:23:23.250305306 +0000 +++ b/sound/pci/hda/patch_conexant.c 2016-03-13 14:48:10.378464731 +0000 @@ -819,6 +819,7 @@ static const struct snd_pci_quirk cxt506 SND_PCI_QUIRK(0x17aa, 0x21da, "Lenovo X220", CXT_PINCFG_LENOVO_TP410), SND_PCI_QUIRK(0x17aa, 0x21db, "Lenovo X220-tablet", CXT_PINCFG_LENOVO_TP410), SND_PCI_QUIRK(0x17aa, 0x38af, "Lenovo IdeaPad Z560", CXT_FIXUP_MUTE_LED_EAPD), + SND_PCI_QUIRK(0x17aa, 0x3905, "Lenovo G50-30", CXT_FIXUP_STEREO_DMIC), SND_PCI_QUIRK(0x17aa, 0x390b, "Lenovo G50-80", CXT_FIXUP_STEREO_DMIC), SND_PCI_QUIRK(0x17aa, 0x3975, "Lenovo U300s", CXT_FIXUP_STEREO_DMIC), SND_PCI_QUIRK(0x17aa, 0x3977, "Lenovo IdeaPad U310", CXT_FIXUP_STEREO_DMIC), Background: Threads with discussions and patches (Conexant, Realtek, differential): http://mailman.alsa-project.org/pipermail/alsa-devel/2012-February/049647.html http://mailman.alsa-project.org/pipermail/alsa-devel/2012-June/052794.html http://mailman.alsa-project.org/pipermail/alsa-devel/2012-June/052853.html Corrections and sound cards additions: http://mailman.alsa-project.org/pipermail/alsa-devel/2013-October/067250.html http://mailman.alsa-project.org/pipermail/alsa-devel/2015-October/098881.html http://mailman.alsa-project.org/pipermail/alsa-devel/2015-December/101612.html http://mailman.alsa-project.org/pipermail/alsa-devel/2016-January/102883.html Various advices to mute one channel of the internal microphone: https://wiki.archlinux.org/index.php/PulseAudio/Troubleshooting#No_microphone_input_on_Acer_Aspire_One http://superuser.com/questions/644314/internal-microphone-no-sound-level-in-pavucontrol-but-record-with-arecord-paca http://unix.stackexchange.com/questions/168200/fix-skype-audio-input-in-mint-17-cinnamon http://askubuntu.com/questions/552010/lenovo-g50-30-mic-built-in-volume-problem http://forum.ubuntu.ru/index.php?topic=259447.0 ...
Данный дистрибутив более не поддерживается. Возможности воспроизвести багу нет. Если проблема всё ещё актуальна в p8 или Sisyphus, пожалуйста, перевесьте на актуальный дистрибутив. Закрываю баг, как End of Life.