自从更新到Win10系统后，我的爱机X220就失去蓝牙功能了。网上搜索了许多解决办法，都没能凑效，今天终于解决了！我的蓝牙回归了，可以考虑买个蓝牙耳塞听听了。
方法献上，为更多苦恼的朋友解决难题。参照下面这个帖子。
https://answers.microsoft.com/en-us/windows/forum/windows_10-networking/how-to-turn-on-the-bluetooth-in-windows-10-on/64dc140c-2209-4d84-872d-bbf5a11f0910
I have fixed the missing bluetooth device on windows 10 with my Lenovo X220i Laptop by upgrading the BIOS from the Lenovo Support Page to the latest.
http://support.lenovo.com/cz/cs/products/Laptops-and-netbooks/ThinkPad-X-Series-laptops/ThinkPad-X220i/downloads/DS018805
The bluetooth device fired up instantly after doing so.
Try upgrading your BIOS of your machine to the latest.
Mine worked fine even though the BIOS upgrade utility does not list Windows 10 as supported OS. It worked just fine.
上面这位先生是在X220i机子上通过升级BIOS实现的。按照他的方法，我把X220的BIOS升级到最新的，Bluetooth立马出来了。我用的BIOS升级程序也不是Win10的，官方现在为止我没找到Win10的，我就用Win8 64bit的BIOS升级程序同样起作用了。
准备淘蓝牙耳机了！
希望能帮到需要的人。