Sorry I used the wrong command...

I've attached the output of -vvxxx below.

There are three files:

* lspci.vvxxx.normal.txt: When the interface is "state DOWN" in "ip link".
* lspci.vvxxx.normal2.txt: When the interface is "state UP" in "ip
link" after I ran "ip link set wlan0 up".
* lspci.vvxxx.normal3.txt" When the interface is connected to the
Wi-Fi of my dormitory and got an address (but without default
gateway, I'm using wired network now).

one more thing?
Are you using KVM with pass-through? Or is it a native installation?