I've tested each option five times with the installed 32-bit kernel
(3.0.0-16.29).

reboot=w: hangs sometimes (3/5)
reboot=k: hangs sometimes (4/5)
reboot=t: hangs sometimes (3/5)
reboot=p: works always (5/5)
reboot=f: hangs sometimes (3/5)

So only reboot=p (and reboot=b) reliably works.  All the others hang on
reboot about half the time.

I'll test a 64-bit kernel next.

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https://bugs.launchpad.net/bugs/950056

Title:
  Reboot hangs on Dell OptiPlex 780 (board 03NVJ6); reboot=bios works
  around

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