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: * 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 * pulseaudio -k && sudo alsa force-reload ## 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 pulseaudio -k && sudo alsa force-reload 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 .... ### If you have opened an app like firefox ... ... before you reload alsa you __must__ do sudo killall timidity **It seems that this line actually is sufficient to fix the problem!** Just try it if you just have a dummy device. Either you have to redo pulseaudio -k && sudo alsa force-reload again or the soundcard will appear immediately.