[Tips] Ubuntu WiFi: SIOCSIFFLAGS: Operation not possible due to RF-kill

我工作是使用阿宅專用IBM x系列的記事本,最近在同的網路切換過程中,常會切換底下的無線網路開關,但是最近遇到一個狀況是,在關閉無線網路後再打開,無線網路的driver就會掛不進來...

無線網路消失... 先試著重新啟動wlan0

$ sudo ifconfig wlan0 up

SIOCSIFFLAGS: Operation not possible due to RF-kill

查詢一下目前radio的狀態

$ sudo rfkill list all

1: tpacpi_bluetooth_sw: Bluetooth
 Soft blocked: no
 Hard blocked: no
2: phy0: Wireless LAN
 Soft blocked: no
 Hard blocked: yes
7: hci0: Bluetooth
 Soft blocked: no
 Hard blocked: no

Soft blocked: no是目前並沒有被軟體禁用,而Hard blocked: yes表示目前被硬體禁用,例如有些laptop有做硬體的radio switch可控制wifi和bluetooth的開啟/關閉,看來除了重開機以外重新載入無線網路模組也許可行

先查詢模組名稱

$ sudo lshw -class network

  *-network DISABLED      
       description: Ethernet interface
       product: 82566MM Gigabit Network Connection
       vendor: Intel Corporation
       physical id: 19
       bus info: pci@0000:00:19.0
       logical name: eth0
       version: 03
       serial: 00:1d:72:94:8c:xx
       capacity: 1GB/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.0.2-k4 firmware=0.3-0 latency=0 link=no multicast=yes port=twisted pair
       resources: irq:42 memory:fe000000-fe01ffff memory:fe225000-fe225fff ioport:1840(size=32)
  *-network DISABLED
       description: Wireless interface
       product: PRO/Wireless 4965 AG or AGN [Kedron] Network Connection
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 61
       serial: 00:1f:3b:82:b7:xx
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlagn driverversion=2.6.35-28-generic firmware=228.61.2.24 latency=0 link=yes multicast=yes wireless=IEEE 802.11abg
       resources: irq:44 memory:fdf00000-fdf01fff

重新掛載

$ sudo modprobe -r iwlagn

再試著重新啟動wlan0

$ sudo ifconfig wlan0 up

wlan0: ERROR while getting interface flags: No such device

看來模組沒有重新安裝成功,重新掛載

$ sudo modprobe iwlagn

再試著重新啟動wlan0

$ sudo ifconfig wlan0 up

重新啟動NetworkManager自動抓取無線網路

$ sudo service network-manager restart

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