I started having this in my fresh install of Hardy. I do not have USB
sound. I have a PCI Razer Barracuda (CMedia CMI8788), attached to
surround speakers. For me the erratic volume control behavior was only
associated with the "Master" channel, and happened whether I used
keyboard volume keys or mouse to adjust. I got around this problem by
setting the master channel to full and hiding it in volume control, so
only PCM showed. I then right-clicked on the Notification Area volume
applet -> preferences and switched to PCM. I then went to System ->
Preferences -> Sound and chose PCM at the bottom as the track controlled
by keyboard.

Fixed it for me.

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[Gutsy] Erratic volume control behaviour
https://bugs.launchpad.net/bugs/158590
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