Please goto System->Preferences->Sound

In there, in Devices tab (the first tab), select the tracks and device
which you want to control with the keyboard keys. In your case, ensure
that PCM track is selected.

This should solve your problem.
Regards,
Shanmu.

-- 
Audio volume control keys control microphone volume instead of PCM volume
https://bugs.launchpad.net/bugs/174292
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