Feisty, for about a month or so.

I can reliably get C3 (and even C4!) when I:
  1) Remove the dri module loading in xorg.conf
  2) either remove uhci_hcd or disable bluetooth+ipw2100 card by the hardware 
switch.

Both conditions must be satisfied to get to C3 states and below.

-- 
Unable to reach C3 or C4 powersaving states when uhci_hcd is in kernel, or 
radeon driver (r300) is in use.
https://bugs.launchpad.net/bugs/105011
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