OS works properly but under "Device Manager" ACPI is not recognized by OS
The above symptom may occur on the following systems:
All Idea Laptop
1. Go to http://support.lenovo.com , click "Drivers and Downloads" and select your product
2. Download the Power Management Driver (Lenovo Energy Management)
3. Install the exe file to your laptop .
4. Restart the computer.
5. It will take effect after restarting the computer
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