08-31-2018 03:55 PM
Lenovo engineering has confirmed that it seems to be a problem with the latest version of Power Management Driver. It has unintended harmful consequences with assorted seemingly unrelated functionality, both in Win10 and Win7, on multiple different laptops.
To avoid the problem, follow these steps to roll back the defective 1.67.14.05 Power Management Driver to the previous problem-free 1.67.14.04:
1. Open Device Manager
2. Expand "System Devices" category
3. Double-click on "Lenovo PM Device"
4. Click on "Driver" tab, and then click on the "Roll Back Driver" button.
I believe verion 126.96.36.199 is OK, but 188.8.131.52 is bad.