Wireless Issue with Thinkpad E420 in Fedora

When switching ON the Wireless on Fedora 16 (Lenova ThinkPad E420) with RealTek WiFi Adapter, it’ll automatically gone back to OFF (Inactive) state.

Exact Log message from /var/messages :


Dec 30 14:51:26 fedora NetworkManager[886]: (wlan0): bringing up device.
Dec 30 14:51:26 fedora NetworkManager[886]: NetworkManager[886]: (wlan0): bringing up device.
Dec 30 14:51:26 fedora kernel: [ 6147.716574] rtl8192c_common: Loading firmware file rtlwifi/rtl8192cfw.bin
Dec 30 14:51:27 fedora kernel: [ 6148.061711] ADDRCONF(NETDEV_UP): wlan0: link is not ready
Dec 30 14:51:27 fedora NetworkManager[886]: NetworkManager[886]: WiFi hardware radio set enabled
Dec 30 14:51:27 fedora NetworkManager[886]: WiFi hardware radio set enabled
Dec 30 14:51:27 fedora NetworkManager[886]: WiFi now enabled by radio killswitch
Dec 30 14:51:27 fedora NetworkManager[886]: NetworkManager[886]: WiFi now enabled by radio killswitch
Dec 30 14:51:27 fedora NetworkManager[886]: (wlan0): supplicant interface state: starting -> ready
Dec 30 14:51:27 fedora NetworkManager[886]: (wlan0): device state change: unavailable -> disconnected (reason 'supplicant-available') [20 30 42]
Dec 30 14:51:27 fedora NetworkManager[886]: NetworkManager[886]: (wlan0): supplicant interface state: starting -> ready
Dec 30 14:51:27 fedora NetworkManager[886]: NetworkManager[886]: (wlan0): device state change: unavailable -> disconnected (reason 'supplicant-available') [20 30 42]
Dec 30 14:51:27 fedora NetworkManager[886]: (wlan0): supplicant interface state: ready -> inactive
Dec 30 14:51:27 fedora NetworkManager[886]: NetworkManager[886]: (wlan0): supplicant interface state: ready -> inactive
Dec 30 14:51:28 fedora NetworkManager[886]: WiFi now disabled by radio killswitch
Dec 30 14:51:28 fedora NetworkManager[886]: (wlan0): device state change: disconnected -> unavailable (reason 'none') [30 20 0]
Dec 30 14:51:28 fedora NetworkManager[886]: (wlan0): deactivating device (reason 'none') [0]
Dec 30 14:51:28 fedora NetworkManager[886]: NetworkManager[886]: WiFi now disabled by radio killswitch
Dec 30 14:51:28 fedora NetworkManager[886]: NetworkManager[886]: (wlan0): device state change: disconnected -> unavailable (reason 'none') [30 20 0]
Dec 30 14:51:28 fedora NetworkManager[886]: NetworkManager[886]: (wlan0): deactivating device (reason 'none') [0]
Dec 30 14:51:28 fedora NetworkManager[886]: Policy set 'Wired connection 1' (p1p1) as default for IPv4 routing and DNS.
Dec 30 14:51:28 fedora NetworkManager[886]: NetworkManager[886]: Policy set 'Wired connection 1' (p1p1) as default for IPv4 routing and DNS.
Dec 30 14:51:28 fedora NetworkManager[886]: Policy set 'Wired connection 1' (p1p1) as default for IPv4 routing and DNS.
Dec 30 14:51:28 fedora NetworkManager[886]: NetworkManager[886]: Policy set 'Wired connection 1' (p1p1) as default for IPv4 routing and DNS.
Dec 30 14:51:28 fedora NetworkManager[886]: (wlan0): taking down device.
Dec 30 14:51:28 fedora NetworkManager[886]: NetworkManager[886]: (wlan0): taking down device.
Dec 30 14:51:28 fedora lldpad[956]: l2_packet_receive - recvfrom: Network is down.

Check the state of the rfkill switches (WiFi switch) :

[[email protected] ~]$ rfkill list
0: tpacpi_bluetooth_sw: Bluetooth
Soft blocked: yes
Hard blocked: no
3: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
4: acer-wireless: Wireless LAN
Soft blocked: yes
Hard blocked: no

Then you need to add the acer-wmi to the blacklist to clear this problem (soft blocked state).

To check whether this solution works or not, please run this :

sudo modprobe -r acer_wmi

If you got the wireless networks back, then you can add this following line to the /etc/modprobe.d/blacklist.conf file :

blacklist acer_wmi

This will permanently solve the wireless problem after a reboot.

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2 thoughts on “Wireless Issue with Thinkpad E420 in Fedora

  1. Hey! This is my 1st comment here so I just wanted to give a quick shout out and say I truly enjoy
    reading through your blog posts. Can you recommend any other blogs/websites/forums that go over the same topics?

    Thank you so much!

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