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http://bugs.kde.org/show_bug.cgi?id=167922         
           Summary: Duplicate sound devices in System Settings
           Product: Phonon
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kretz kde org
        ReportedBy: echidnaman gmail com


Version:           4.2.0 (using KDE 4.1.0)
Installed from:    Ubuntu Packages
OS:                Linux

When logging in to KDE, a notification pops up that says something like "The audio playback device x does not work, falling back to audio playback device x".

So I said, "It's falling back to the same thing it says is failing. I wonder what's up with that..."

I opened up System Settings and went to the Sound category. Under the devices list I found two entries for my sound card. Preferring the second device over the first device silenced the error message.

I'm guessing this is probably somewhat widespread, because I stumbled upon someone else having this problem here: http://mine.icanhascheezburger.com/view.aspx?ciid=1665143 (Also provides a screenshot, albeit a somewhat sensationalistic "for the lulz" one. ;) )