Masalah Unknown device terjadi saat instal windows 7 pada Lenovo G450, ketika di cek semua driver terinstall dengan baik tetapi ada satu tanda ! di device (ACPI\VPC2004).
Solusi :
1. pergi ke alamat support.lenovo.com , click "Drivers and Downloads" and select your product
2. Download Lenovo Energy Management
3. Install
4. Restart the computer
Unknown Device pada Device Manager Hilang.
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