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[ubuntu] Dell Bluetooth keyboard volume knob not "fading" volume

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http://ubuntuforums.org – Running Ubuntu 9.04 on a Dell Latitude D830. Also running a Dell BT keyboard without USB dongle (because laptop has BT built-in). This used to work then suddenly stopped. The volume knob used to allow me to incremently adjust the volume. Now it's either on or off (the sound that is, via the knob on the keyboard). Hoping this makes sense. When I turn the knob I see the volume adjusting on the screen, but nothing happen to the actual volume. That is until the very last "on-screen notch"...it'll then turn the sound off. Again...I hope this makes sense. Any thoughts? Thanks Rick (Hardware)