I recently upgraded to the 4.7.2 kernel, but I don't think that's relevant because audio was working previously with this kernel.
This happened after I woke my computer from a suspend and then muted and unmuted my audio with "amixer -q set Master toggle". (Which is what is usually necessary to make audio work after sleep for me.)
I have tried:
Re-emerging both pulseaudio and alsa-utils - no effect, "pacmd set-default-sink 0" - no effect. (Headphones plugged into sink 0), "pacmd set-default-sink 1" - no effect. (Headphones plugged into sink 1), "pulseaudio -k" - no effect, "/etc/init.d/alsasound restart" - no effect, muting and unmuting alsa - no effect, and "speaker-test -c 2 -r 48000 -D hw:0,3" - also no effect.
I'm not sure if I'm confusing cause and effect here, but I've brought audio back by powering down my computer, unplugging it and discharging the power supply. Strange. I think this is in fact a driver problem, because I had to deal with my wifi card in the same way on 4.5.2.
No audio - but worked previously
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