I have tried all solutions found here or on ubuntuforums.com, but no luck whatsoever.

It all started very randomly: I had my mother's nokia lumia connect via usb to my lenovo x230t, I disconnected it (without safely removing it first - ouch) and, when I unplugged the cable, I got the network disconnection alert on the top right corner of the screen and the wifi got hardware blocked.

My rfkill list is

0: tpacpi_bluetooth_sw: Bluetooth
    Soft blocked: yes
    Hard blocked: yes
1: tpacpi_wwan_sw: Wireless WAN
    Soft blocked: no
    Hard blocked: yes
2: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: yes

After this moment it the "Enable wifi" option has always been greyed out. I've tried :

  • the FN+key button, but no message whatsoever (actually looks like that command is not recognised)

  • sudo rfkill unblock 1 and 2, but no effect whatsoever

  • sudo rfkill unblock all, but nothing

  • blocking first, and this changes the no to yes, but then redoing sudo rfkill unblock 1changes only the Soft blocked, leaving the Hard blocked to no

  • echo blacklist acer-wmi | sudo tee -a /etc/modprobe.d/blacklist-acer-wmi.conf and nothing even here

  • tried in the BIOS, but in my version there's no "Wireless Radio LAN" option

Another piece of information: every time I open System settings -> Network, the Airplane mode is on This has never happened before, so the cause is surely linked to the unplugging the smartphone. Maybe it hit on a system bug. Now the question is: how do I fix it?

I beg some expert for help, as this is the laptop I use for work and not being able to connect wirelessly is creating quite some problems. Thank you

  • Can you provide dmesg output? – Arch user Jul 24 '15 at 8:35
  • Does your PC has an hardware switch(eg. Fn+wireless, trigger,...). If so, try to toggle it (there won't be any output) and check rfkill status again – Arch user Jul 24 '15 at 8:39
  • Yes, there's the Fn key but pressing it with the wireless button has no effect whatsoever, not even a symbol or communication on the screen. nothing, dead. I'm posting the output of dmesg on an answer as it's too long for a comment – andrea Jul 24 '15 at 11:39
  • Use pastebin to post dmesg output – Arch user Jul 24 '15 at 11:46
  • thanks, great idea! here's the URL (hope this is the right way) pastebin.com/MuHKqZ0F – andrea Jul 24 '15 at 11:49

if you have the realtek NIC then you should try this tape trick to mask a pin only after the problem still persists after trying the other solutions such as unblock command. In my laptop the same problem had occurred and I myself applied the trick and since then my WiFi works like charm.

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