My HP laptop PSU carries the earth connection through to the dc barrel as well (found this out yesterday).
Very doubtful if the earth connection in the HP or the Dell provides any protective earth facility, though.
Probably just functional, for the SMPS earth leakage.
C&G 2377 -01 & -02
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Why some laptops need to be class 1 I don't know. It causes more grief than good. I use a laptop for audio to a PA system, and have had to use a special lead with the screen only connected at one end, other wise you get all sorts of Earth loop; hum!!
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