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A few days ago, everything with my HDMI was working fine - sound and video. Yesterday, PulseAudio Volume Control no longer detects HDMI output as an audio output - video still works fine. I don't think I changed any programs or files that would effect this, but running alsamixer now says cannot open mixer: no such file or directory. How do I make alsamixer and PulseAudio work again?

Screenshots: Upgraded and uninstalled programs since it last worked: Software Center Changes

PulseAudio Output Devices: (Should have digital option) PulseAudio

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Looks like you hit the bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1457369.

It will be fixed in 3.19.0-20.20 which will be released the end of this week. If you can't wait, you can either downgrade your kernel or grab 3.19.0-20.20 from trusty-proposed (see https://wiki.ubuntu.com/Testing/EnableProposed)

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