One day when I was trying to connect with wireless I found it didn't work.It said:
wireless is disabled by hardware switch
I'd found some questions similar to mine, so I tried some suggestion as following:
~$ rfkill list
0: ideapad_wlan: Wireless LAN
Soft blocked: yes
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: yes
Hard blocked: yes
so I typed:
sudo rfkill unblock all
Then I got:
rfkill list all
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: yes
but the wireless still didn't work. I'm sure wireless lan is enabled in BIOS and the hardware switch is turned on (a small switch on the front side of my laptop). Also Fn+F3 or Fn+F5 didn't work.
I was in Ubuntu 12.04 and I thought it might be a system problem, but when I started my laptop with Ubuntu 12.10 installation disk, this problem still exits.