@jaroslav you RULEZZ! This has, indeed, solved reported problem, now both microphones work! Thanks a lot!
SOLUTION SUMMARY: 1) use kernel 5.11+ 2) use `snd_sof_intel_hda_common.hda_model=alc255-acer` kernel boot parameter -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1912052 Title: [Acer Spin 5 - SP513-54N] External headset microphone not working on Ubuntu 21.04 (not even wired, cable headset) To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1912052/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
