yesterday March 18th 2020, I made an Ubuntu update and both the sound and the microphone stopped working. I tried to perform a complete reinstallation, but nothing to do. Until the day before, everything worked properly. Ubuntu 18.04 operating system. Computers: Lenovo Yoga C930. Thanks a lot
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1Does this answer your question? Ubuntu 18.04 audio disappeared after update – guiverc Mar 20 '20 at 02:43
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It's a kernel bug > 5.3.0-40.
Add options snd-hda-intel dmic_detect = 0 in the /etc/modprobe.d/alsa-base.conf.
After adding the line to the config file reboot works: the audio problem is solved, NOT the mic problems.....
user299819
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