If you are trying to get sound with hdmi? try the command pulseaudio -K in terminal, reconnect hdmi and see if you see the hdmi sound option available in sound settings. By clicking on the sound icon in panel and clicking sound settings.
Vsync is always a problem in gnulinux for me when playing some videos from
browser fullscreen. Not much you can do about it imo, even with the
proprietary driver.
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