I uninstalled ThinkPad Power Manager to see if it causes the problem, but the problem persisted. So, the program isn't the cause of the problem.

Changing the power plan, as Hauskaz said, isn't a solution. The screen remains still dim. I asked for a solution on Lenovo's forum. Someone told me to disconnect and then reconnect the charger to the laptop. I tried his solution and it was surprised to find out it really works. Now the problem is wh...

I have this problem too. I have a X60 tablet with Windows 7 Professional 32-bit. Did anyone solve the problem?