I'm using on Xubuntu 14.10 and I have exactly this model: 80J80021US
I've installed the bcmwl-kernel-source package, used this command sudo rfkill unblock all and also tried to disable ideapad_laptop by running sudo modprobe -r ideapad_laptop.
Nothing seems to work.
If I don't remove the ideapad_laptop I can see the device on the rfkill list:
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
When I use the command modprobe -r, then there's no wifi adapter at all:
2: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
I found a post that said that I should add the wl module to /etc/modules. But then the following is in my log file:
[ 5.069958] wl: module license 'MIXED/Proprietary' taints kernel.
[ 5.072260] wl: module verification failed: signature and/or required key missing - tainting kernel