TG Daily and Tom's Hardware Guide have been in communication with Intel representatives throughout this week about our findings described in this article. Late Friday, Microsoft acknowledged to TG Daily - via the hands of Intel - that they believe the problem our engineers observed to have been caused by a misbehaving driver included in Windows XP SP2 - specifically, the Advanced Configuration and Power Interface (ACPI) driver, which is part of the operating system's power management scheme for USB 2.0.It's quite a big problem - it's not just a few minutes less battery life but more than an hour! According to benchmarks from TG Daily on a notebook with Intel's Core Duo T2300 this flaw decreased battery life with a shy 72 minutes.
Both Microsoft and Intel are working on a fix for this problem, but they don't promise anything. More details about this bug can be read over here.