the network manager told me "Wireless is disabled by hardware switch" the rfkill shows there is no soft or hard lock on my wireless card.
i managed to connect to wifi manaully by using wpa_supplicant, that means there is nothing wrong with my hardware nor driver. i wonder if there are bugs in NetworkManger? How can i connect through NetworkManager? It's much more convinient to use it!
BTW, i has 2 wireless card, but the internal is broken. im using the usb wireless card.