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RadeonDriver - Community Help Wiki - Ubuntu
https://help.ubuntu.com/community/RadeonDriver#:~:text=Ubuntu%2012.04%3A%20users%20have%20to%20enable%20HDMI%20audio,echo%20%22options%20radeon%20audio%3D1%22%20%7C%20sudo%20tee%20%2Fetc%2Fmodprobe.d%2Fradeon.conf
12.04 - No sound coming from HDMI - Ask Ubuntu
https://askubuntu.com/questions/207889/no-sound-coming-from-hdmi
Go to Dashboard home. Find sound properties and change the audio output to HDMI. http://voices.canonical.com/david.henningsson/2012/04/14/audio-over-hdmi-and-displayport-in-ubuntu-12-04/ My HDMI output audio (SPID) started to work right after the first step from the link above, by just installing the latest drivers from Nvidia.
sound - Can't configure 5.1 audio with 12.04 - Ask Ubuntu
https://askubuntu.com/questions/138194/cant-configure-5-1-audio-with-12-04
Go to the Devices tab. You'll see a list of Sinks and Sources. You should have 2 sinks by the way, one for your analog Intel output and one for the NVidia HDMI. At this point you should start your audio/video application that uses Pulse Audio for the output and …
Ubuntu – 12.04 Ubuntu: configuring laptop to hook up to TV ...
https://itectec.com/ubuntu/ubuntu-12-04-ubuntu-configuring-laptop-to-hook-up-to-tv-using-hdmi-cable/
There should be a drop-down menu for your sound card labeled Profile, select Digitl Stereo(HDMI) Output from this menu. Once this is done, the Sound control panel should show both the built-in speakers and the HDMI output and you should be able to switch between them as often as you want from there while you are plugged in to the HDMI output.
12.04 - HDMI Audio stops after TV turned off - Ask Ubuntu
https://askubuntu.com/questions/133575/hdmi-audio-stops-after-tv-turned-off
Turn off the TV and BART's HDMI audio will go away, and the HDMI option vanishes from the sound menu. I had an occasional HDMI issue with 11.10 but turning on/off the TV would fix the sound. How can I hardcode things so that it always uses HDMI out of audio? I suspect the TV is sending a signal upon that 12.04 is now listening for.
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