Watching movies on TV using HDMI support in Ubuntu 10.04 – Abhishek Mahanty's Blog
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ubuntu - Pulseaudio two outputs in one profile don't work proper - Unix & Linux Stack Exchange
Ubuntu Forums
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sound - 5.1 audio via HDMI only plays on two channels - Ask Ubuntu
HDMI audio not showing [21.10] - Raspberry Pi - Ubuntu MATE Community
Adjust the sound volume in Ubuntu 20.04 using a simple utility. ┃ Securitron Linux blog.
Why can't I change the default output sound device on Ubuntu 20.10? | ParanoidPenguin.net
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Fix No Sound Through HDMI In External Monitor In Ubuntu Linux
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Ubuntu 20.04 plays sound only through HDMI monitor - Ask Ubuntu
Quick Tip: No Sound from HDMI Display / TV – UbuntuHandbook