Probably the FreeBSD is working as Windows, they use the software de- noise filter when users record sound.
Please test with "pactl load-module module-echo-cancel", then choose echo-cancelled record device from gnome-sound-setting->input tab. Now record sth, and play it. Is it better now? If there is sth in the kernel driver to introduce the noise, the thing I can figure out so far is change the micbias reference voltag: Right now the reference for two mics: Rear Mic: Pin-ctls: 0x21: IN VREF_50 Front Mic: Pin-ctls: 0x24: IN VREF_80 You can try to set them with different value like "HIZ 50 GRD 80 100", maybe some value can improve the sound quality. The patch_realtek.c has some sample code to set verf. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1801540 Title: Microphone distorted sound on ALC892 Status in linux package in Ubuntu: Incomplete Status in pulseaudio package in Ubuntu: New Bug description: Not sure if I'll report this upstream but there is definitely an issue with microphone recording on my desktop, this is not happening on my laptop which has a different codec. Already tried all workarounds possible, no luck. Only with my desktop with this particular motherboard. No issues in Windows, the sound recorded in there is distorted and has some static and robotic tone on high-pitch. alsa-info on the attachments To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1801540/+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
