Recently I have been noticing that my new T41 performance seemed unusually s-l-o-w when running on battery power. I know IBM sets the Pentium-M power management to auto-throttle down to 600MHz on battery power by default and I verified this with CPU-Z. But even with the lower CPU speed the T41 still seemed way too slow in battery mode. Today I did some checking and pulled up the task manager to look at the CPU and process information, and found the RUNDLL32.EXE process to be using 99% of the CPU resources! Rundll32 was hogging all the CPU so apps and IE were being starved for CPU. I did a little further checking and found the rundll32 was normal when running on AC, 0-1% CPU. So something was definitely not right with something in the power management settings when running on battery. I isolated the problem to a setting in the ATI Mobility Radeon 7500 driver. ATI has power management built into the video driver that is called Powerplay and IBM has it enabled by default. When I disabled the Powerplay ATI PM and rebooted my battery performance was greatly improved and the rundll32 process usage was back to normal, 0-1%. Not sure how much this being disabled is going to hurt by battery life but it might even improve it since the CPU will not be running at 99-100% all the time on battery. I am going to download and install the latest ATI Mobililty Radeon driver from IBM later and see if this bug is fixed in the newer driver. I am kind of surprised that this bug was missed by IBM in their PM setup for these T41 models. Will post back if the newer driver has fixed the problem.