soundubuntuonlydummydevice [Homer's Tec-Fiddle-Wiki]

Diese Seite ist nicht editierbar. Sie können den Quelltext sehen, jedoch nicht verändern. Kontaktieren Sie den Administrator, wenn Sie glauben, dass hier ein Fehler vorliegt.

<markdown>
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:

* <https://www.linuxuprising.com/2018/06/fix-no-sound-dummy-output-issue-in.html>
</markdown><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><markdown>

* <https://bugs.launchpad.net/ubuntu/+source/linux-oem-osp1/+bug/1864061>
</markdown><cli>
pulseaudio -k && sudo alsa force-reload
</cli><markdown>

## 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 </markdown><cli>
pulseaudio -k && sudo alsa force-reload
</cli><markdown> 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</markdown>
<cli>sudo killall timidity</cli>
<markdown>**It seems that this line actually is sufficient to fix the problem!**
Just try it if you just have a dummy device.</markdown>
<del><markdown>Either you have to redo </markdown>
<cli>pulseaudio -k && sudo alsa force-reload</cli> 
<markdown>again or the soundcard will appear immediately.</del>

</markdown>