On my system (Thinkpad W510 laptop), something switched all audio output to 
HDMI during the Kubuntu Oneiric upgrade.
This left me with no working sound, since I had no HDMI monitor plugged in.

To find and fix this, I used the KDE System Settings GUI:
    System Settings --> Multimedia --> Phonon --> Audio Playback

Select Device Preference:  "Audio Playback"
       Select Default Audio Playback Device: "Internal Audio Analog Stereo"

Press "Prefer" until it is the First item in the device list.
Press "Apply Device List To...";  (I chose every category) Press Okay
Press "Test" -- works for me.

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https://bugs.launchpad.net/bugs/862495

Title:
  [Oneiric] No sound after lock screen dialog (after upgrade to
  PulseAudio 1.0)

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