[Regression] Battery life halved - bisected to 0cc2b4e5a020fc7f4d1795741c116c983e9467d7

[Mike Keehan]

Hi,

I noticed last night that my battery lasted only half as long as
usual.  So I checked some previous rcs which were all OK.  Bisecting
led to "0cc2b4e5a020fc7f4d1795741c116c983e9467d7".  And reverting
that from rc7 restores battery life to its usual state.

(Now, can anyone tell me how to remove the revert I did :)

Mike.