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73416ba
(Get the code!)
I would also agree that this really needs fixing. I have tried a large range of kernels now ranging from 2.6.31 through to 2.6.35 (maverick kernel) and compared wakeups using powertop. The only sensitivity in this list is that the earliest kernel (Karmic kernel 2.6.31) shows half the wakeups of all the other kernels. Such a result is consistent with the many reports above of a halving of battery life between Karmic and Lucid.
I also note that this issue was raised on the kernel mailing list in April and May and a patch was suggested but there was no follow up. Note that this is also a Debian bug as well. My strong suspicion is that this is a basic problem with the kernel and switching to another distro would not help. If this is not the case I would welcome evidence that another distro with a kernel in the range 2.6.32-2.6.35 DOES NOT have this issue.
If it is an upstream kernel problem I think that someone needs to lodge a critical bug on the kernel bugzilla.