Keyboard volume keys don't work after latest F16 update

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http://forums.fedoraforum.org – I installed the latest set of F16 updates (including a kernel update) and rebooted this morning, to find that the volume keys on the keyboard now don't work. They are recognized as keys - if I go to the keyboard settings and shortcuts, I can select the shortcut for "Volume down" and press the volume down key, and it shows up. However pressing it generally doesn't do anything to the volume. Any ideas on how to address this? I'm not sure what is responsible for handling these keys and adjusting the volume. ---------- Post added at 10:22 PM ---------- Previous post was at 12:35 (HowTos)