linux kernel rfkill

After I installed ArchLinux, I found there were no wifi i can connect, and got errors: your wireless card not opened

sudo rfkill list

output:

0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: yes

that Hard blocked: yes means your hardward wifi button off, pls set it on.
so strange, wifi is ok after i switch windows 10.
and i tried to press [Fn]+[F2], but problem persisted.

i guess it's a trouble of kernel module rfkill.
create a file named rfkill.conf in /etc/modprobe.d.
puts these content into it to prevent kernel loading rfkill

blacklist rfkill

reboot, then you can ride on the Internet with freedom.

refer to arch wireless network connection