How to Raise CPU Fan Speeds on a Lenovo Laptop - Laptop Nov 06, 20124. If the control is on "automatic," change it to "manual." Type in the percentage at which you would like the CPU fan to operate (100 would be 100%). 5. Click "F10" on the upper-right corner of the keyboard and restart your laptop. After the laptop restarts, the Lenovo CPU fan will be noticeably louder.