Thinkpads Forum

http://www.notebookcheck.net/Lenovo-Thi ... 770.0.html

The display backlight flickers at 220 Hz (Likely utilizing PWM) Flickering detected at a brightness setting of 90 % and below.

I don't even know if I had ever seen the PWM on any system. Have you tested some computers with PWM and does this bother you? No offence, just askin'.