To resolve this issue, download and install the latest BIOS Update for your notebook from the manufacturer site. Later perform the following steps:
Power Management reinstall:
1. Click Start, type "device manager" in search tab.
2. Locate device manager from search list and pen it.
3. Click "+" beside System devices.
4. Select ACPI Fixed Feature Button.
5. Right-click the device and select Uninstall.
6. Restart the system.
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