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Fix No Sound (Dummy Output) Issue In Ubuntu With SND HDA ...

https://www.linuxuprising.com/2018/06/fix-no-sound-dummy-output-issue-in.html#:~:text=In%20case%20you%27ve%20plugged%20in%20an%20HDMI%20cable%2C,then%20you%20can%20unplug%20the%20HDMI%20cable%20again.

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No sound on HDMI Ubuntu 20.04 - Ask Ubuntu

https://askubuntu.com/questions/1256043/no-sound-on-hdmi-ubuntu-20-04

Open the audio mixer (it's called pavucontrol here) Switch to the Configuration tab (rightmost tab), There is a dropdown for selecting the profile for the builtin audio device. Here I could select a HDMI profile, just be careful to pick one that is not marked as not available. After that, audio through HDMI worked just fine.

Fix No Sound Through HDMI In External Monitor In Ubuntu ...

https://itsfoss.com/how-to-fix-no-sound-through-hdmi-in-external-monitor-in-ubuntu/

Type “sound” in Unity dash (by pressing the Super/Windows key) or from the top right corner choose the system settings and then look for sound setting. Step 2. In the sound settings, in Output tab the built-in-audio was set to Analog Stereo Duplex. Change the mode to HDMI output Stereo.

Ubuntu 18.04 -- No HDMI sound - Ask Ubuntu

https://askubuntu.com/questions/1177066/ubuntu-18-04-no-hdmi-sound

There should be a number of HDMI options here (for me, a lot.) Plug in your HDMI device (unplug it first if needed.) For me plugging in changed the drop down to a workable one. If this doesn't work just pick some. Go to the Output tab, see a HDMI device selected Try playing some sound Share Improve this answer answered Dec 24 '20 at 5:00 phs 309 2

No sound through HDMI - Ubuntu Mate 20.04 / Pi4 ...

https://ubuntu-mate.community/t/no-sound-through-hdmi-ubuntu-mate-20-04-pi4/22478

When open indicator-sound-switcher, there is no window, just an icon appears in notification aera, near the sound indicator. Click on the icon of indicator-sound-switcher and select HDMI output. About the error in sources: sudo apt update ...

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