T61P Speedstep Problem

[Daniel]

Hi, I just finished doing a clean install of Windows XP Professional. Everything is working just fine except for the speedstep. The processor is constantly at full speed and will not clock down. I have the Lenovo ACPI and Intel Chipset drivers installed. What else am I missing? I've tried installing the Lenovo Power manager but it made no difference. The notebook runs noticebly warming in XP than in it does in Vista because of this issue.

[NaT]

Have you tried checking in the BIOS? There's a config in Power Management menu on how the CPU/Monitor/HDD/... perform on AC and on battery setting.

[Daniel]

Yep, I did check the BIOS. Usually the OS power management options override the BIOS settings. I think the BIOS settings are for environments without dedicated power management controls.