Symptom:
The wireless setting option of IdeaPad series notebook Win8 is gray and cannot be adjusted, which causes wireless to be turned on.
Solution:
Take Y400 as an example: Uninstall the power management (Energy Management) version 8.0.2.4 installed under Win8 in the program function
Then go to the official website to download and install Power Management 7.0.4.1 version under Y400 Win7
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