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Amazon.com: USB to HDMI Adapter, HD Audio Video Cable Converter, USB 3.0 to HDMI for Multiple Monitors 1080P, Compatible with Windows XP/10/8.1/8/7 (Not Support Mac, Linux, Vista, Chrome (Gray) : Electronics
Pulseaudio = no sound via hdmi, pulseaudio --kill = everything fine / Multimedia and Games / Arch Linux Forums
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sound - How do you set a default audio output device in Ubuntu? - Ask Ubuntu