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For some reason, upon upgrading to Ubuntu 16.04, my volume and brightness media controls are no longer registering as XF86 keys. I created an acpi event and action script for my screen brightness in /etc/acpi wherein I modify the number in /sys/class/backlight/acpi_video0/brightness, which works fine.

Unfortunately, I've not been able to track down where in /sys/class I can modify volume. Searching online hasn't yielded any results - anyone have any suggestions?

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    Try searching for how to increase and decrease volume on pulseaudio with relative values on the command line. I've found it before... – Zip Dec 23 '17 at 1:52
  • As far as I am aware, no driver (not even laptop specific ones) has volume control via ACPI. That's done via the audio hardware, i.e. ALSA, or Pulseaudio on top of it. – dirkt Dec 23 '17 at 6:38

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