niggly issue with earphone

[G.]

On Ubintu 11.10 upgrade from 11.04, after I plug in then remove
earphones, there is no sound from the external speakers.  I checked
the sound settings and nothing is muted.

Aft F@ aplay /usr/share/sounds/alsa/Front_Center.wav produces no sound.

List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC269VB Analog [ALC269VB Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0


I am using a Samsung netbook N110.

Need any other info, please let me know.

Thanks


gary