Pavilion DV4: Laptop plays sound through headphones but not by internal speakers

Audio was working fine on my laptop, when suddenly the laptop would not play sound with internal speakers.  If I plug in headphones sound is fine.  Execution of control panel of configuration/sounds shows 'Speakers and dual headphone - IDT High Definition Audio CODEC' enabled and set as the default device, as well as "independent double headphones" (enabled by default but not) and 'SPDIF (Digital Out via HP docking station)' disabled.  What can be wrong?

Cure the problem by uninstalling the CODEC driver, then restart Windows then reinstalled, and now things are ok again.

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