Audio Output Preference Weirdness

I'm running 10.6.2 on a MacPro 2.93x4. The sound output preference (seen by option-clicking the speaker in the menu bar) is set to Line Out.
Almost every time I wake the computer up, the keyboard volume control no longer controls that volume. I get the visual feedback onscreen but the volume doesn't change (nor do the little "sound" lines next to the speaker icon in the menu bar). When I go to the menu item, Line Out is still selected. When I reselect Line Out the volume keys will control it properly.
Anyone else having this issue? I've seen posts where peoples' output choice changes, but none where the choice stays the same but there's no control over it.

I have the same problem. The only work-around I've found, is that I hold Option when pressing one of the Sound keys (e.g., Option+Mute, Option+Down or Option+Up), and the System Preferences launches to the Sound PreferencePane.
Then I switch to something besides Line Out and then back, and my keyboard can again control the sound.
It's frustrating--especially when I start music, and it starts blaring in my office before I can pause it and fix the sound.

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