Installed Yosemite - audio line out no longer working

After installing Yosemite, sound will only play from my Mac Pro's internal speakers.
Opening Preferences > Sound and selecting Line Out has no effect.
Why does the Line Out no longer work with Yosemite?

Update:
Seems issue with keyboard volume not working crops up again each time the system enters "sleep" mode.
Volume controls will visually make the volume appear to adjust on screen, but not affect sound level to external speakers.
Only solution I've found so far is a reboot.
Never encountered this with Maverick's or any previous OS.

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