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sound - Ubuntu 18-04 - no HDMI audio with AMD Radeon HD ...
https://askubuntu.com/questions/1032811/ubuntu-18-04-no-hdmi-audio-with-amd-radeon-hd-7870#:~:text=First%20check%20that%20the%20kernel%20can%20control%20the,kernel%20can%20see%20and%20control%20the%20audio%20hardware.
ATI HDMI Audio not working / Newbie Corner / Arch Linux Forums
https://bbs.archlinux.org/viewtopic.php?id=132938
Re: ATI HDMI Audio not working. Evergreen = HD5430 - HD5970, all HD6000 not listed under Northern Islands, HD7350. Northern Islands = HD6450, HD6570, HD6670, HD6790 - HD6990, HD64xxM, HD67xxM, HD69xxM, HD7450 - HD7670. So it seems our HD6250/6310 are in fact evergreens, which have hdmi-audio output in 3.3 kernels...
[SOLVED] ATI HDMI audio doesn't work with ... - Arch Linux
https://bbs.archlinux.org/viewtopic.php?id=214941
Re: [SOLVED] ATI HDMI audio doesn't work with pure ALSA. Pulseaudio tends to change alsa configuration files to make PA and alsa work together. Those changes often make it impossible for pure alsa to work. look for ~/.asoundrc and /etc/asound.conf . if they exist, move/delete them, reboot and try again.
How to get Sound Over HDMI With ATI - Linux Mint - Community
https://community.linuxmint.com/tutorial/view/1051
HDMI Audio is disabled by default on kernel 3.0+ due to a black screen on some monitors. To get audio working again go to: etc/default/grub. Open grub as administrator with a text editor. Then change the line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash". to. GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1".
No sound on HDMI Ubuntu 20.04 - Ask Ubuntu
https://askubuntu.com/questions/1256043/no-sound-on-hdmi-ubuntu-20-04
On a recent installation of Arch Linux I found out that HDMI audio was not working due to a regression in the Linux kernel. The bug is documented here: Bug 207223 - linux-5.6.x breaks NVidia HDMI audio. The fix was either to revert to a kernel <= 5.6 (version 2020-04-01), or use an LTS Kernel (which I did) and that solved the issue for me.
Fix No Sound Through HDMI In External Monitor In Ubuntu Linux
https://itsfoss.com/how-to-fix-no-sound-through-hdmi-in-external-monitor-in-ubuntu/
Even if the second solution did not work, try changing the configuration with PulseAudio Volume Control. Step 1. Open a terminal and use the following command to install PulseAudio Volume Control: sudo apt-get install pavucontrol Step 2. Open PulseAudio Volume Control. Step 3. Under the Configuration tab, change the built in audio profile to HDMI:
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