So, after applying the various settings and updates I mentioned in my previous post, I've generated a new graph of the power consumption by the same ThinkPad. The original plots are still included for reference. This time the machine wasn't sitting completely idle, since I was using it at the time, mostly to post my previous entry and to continue researching power tweaks, so the graph is noticably less stable. But it's still very interesting:
You can see that, while it's not yet quite as battery friendly as the T40p, the T60p running Linux 2.6.22 uses much less power than it used to!
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