knorth55's memo

Technical memo by @knorth55

ThinkPad T450 cannot detect wifi adaptors

My T450 suddenly could not find wireless devices with lcpci.

$ uname -r
4.2.0-42-generic 

$ lspci -nn | grep -i net
00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection (3) I218-V [8086:15a3] (rev 03)

I upgrade BIOS version, reboot, and press Fn + F2 and now I can use wireless connection.