My 4300u SP2 (256GB) has been showing odd power management (mis)behaviors after shutdown and subseqent startup. This machine (lot 1352, 4300u) was not affected by the December 10 FW issue, and has not yet received the Jan 2014 firmware update. What I've noticed is that after shutting down the SP2, and from the off state powering it up again, under minimal load the CPU utilization is 25% or 33% depending on power setting. (Power saver/Balanced vs. High performance.) If left running at this abnormally high rate, the tablet begins to heat up after 15 to 30 minutes. If I trigger sleep (with power button, or menu), and then wake up the CPU, usage falls to near 0%. Length of the sleep interval doesn't matter, the effect is the same. Also, when processor utilization falls to 0%, the CPU speed continues to hover around 2 GHz for at least a few minutes, even if the Power saver option is in effect. However, the CPU speed does eventually slow down to its "low power" level, ~ 0.75 GHz. My SP2 shows such behaviors consistently, if not quite every cycle. There was no difference regardless of battery vs. AC-power, power option setting or any other setting changes I tried. (Note that the issue doesn't arise with a "restart" operation vs. powering down completely and then powering up again.) To reproduce the problem, close all apps, set Power Option to Power Saver, choose shutdown from the menu. Let the computer remain off for >= 15 sec. Then power up, log in, go to task manager performance tab/CPU data. The utilization will be ~25/33%, and CPU speed ~2.0 GHz. Activating sleep mode and then waking from sleep will show CPU at or near 0%. CPU speed should fall to 0.75 GHz after several minutes. The "revved" CPU issue may not be particularly obvious, but conceivably could be contributing to suboptimal battery life on SP2's. Fortunately, if it's known to be occurring, working around the problem isn't too difficult. If anyone tries to replicate this SP2 behavior, I'd sure appreciate learning about the outcome whichever way it turns out. And if anyone knows what's going on, I would very much like to understand it. Thanks.