[Bug 616578] [NEW] Can't get to low C-states using 2.6.35 karmic backport

[Geoffrey Hausheer]

Public bug reported:

Using 2.6.35-14-generic maverick backport kernel on Lucid (10.04 UNR), my Atom N450 based netbook can only get into C2 (in the default 2.6.32 kernel the netbook will go into C3).  This results in significantly reduced battery life (~1hour as far as I can tell).  The 2.6.35-14 comes with the new intel_idle module, but as built it can't be installed because it loads after acpi.  Recompiling the kernel with intel_idle compiled into the kernel (not as a module), allows the laptop to go into C4, and power is comparable to 2.6.32.  I'm not sure this is a good idea as the capability is marked experimental, but without this change, my system power is significantly higher with 2.6.35 than with 2.6.32.
I haven't looked at the Maverick kernel options yet, but It would be unfortunate if netbook power was significantly worse on 10.10 than 10.04

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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Can't get to low C-states using 2.6.35 karmic backport
https://bugs.launchpad.net/bugs/616578
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