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After Upgrading to Ubuntu Focal (20.04) unfortunately the sound on my Lenove Yogabook 11e stopped working.
More concrete it didn't show any of the two sound devices I found by cat /proc/asound/cards in the shell, but an
Dummy Device Only
It took me some searches to find the following sources that let me fix the problem and get back a working sound system:
<cli> echo „options snd-hda-intel dmic_detect=0“ | sudo tee -a /etc/modprobe.d/alsa-base.conf
echo „blacklist snd_soc_skl“ | sudo tee -a /etc/modprobe.d/blacklist.conf
</cli>
<cli> pulseaudio -k && sudo alsa force-reload </cli>
Update
Kernel: Linux 5.4.0-52-generic #57-Ubuntu SMP Thu Oct 15 10:57:00 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
With this Kernel it suddenly became necessary to
- undo the changes in alsa-base.conf (e.g. by commenting out the above mentioned lines again)
- reboot device
- but still
<cli> pulseaudio -k && sudo alsa force-reload </cli>
once after a fresh reboot.
Linux ThinkPad-Yoga 5.4.0-53-generic #59-Ubuntu SMP Wed Oct 21 09:38:44 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
:eyeroll: Six days later the commented lines have to be uncommented again. Just because ....
homer