I have a HP NC6120 laptop for a few years. It is a bit long in the tooth but works perfectly well as a Web Browser Appliance. I have had a number of Linux distributions on it and it is currently runing Arch Linux.
Anyway, someone, who shall remain nameless, spilled a glass of water on it. I removed the power and all the batteries and let it dry for a few days.
When I powered it up again, it started up perfectly, with no ill effects from it's recent accident.
The only thing was that the WiFi was no longer working.
There was a clue in the dmesg log. It said "radio frequency kill switch is on". What the feck did that mean?
I followed many bread crumb trails that led to dead ends.
I eventually came accross a reference to a program called 'rfkill'. I wired up the laptop and installed the rfkill package.
Running it, I got the following:
[root@daffy ~]# rfkill list
0: hp-wifi: Wireless LAN
Soft blocked: no
Hard blocked: yes
1: hp-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
3: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
I simply ran 'rfkill unblock 0'
Running rfkill again, I got the following:
[root@daffy ~]# rfkill list
0: hp-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
And the wireless worked again.
Woohoo! Time for a beer.
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