Intel PRO/Wireless 3945ABG Mini-PCI Express Adapter

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This is a Mini-PCI Express WiFi Adapter


  • Chipset: Intel WM3945AG
  • IEEE Standards: 802.11a, 802.11b, 802.11g
  • PCI ID: 8086:4227

Mini-PCI WiFi Adapter

IBM Partnumbers

  • 41A4068
Only the IBM Parts will work, any other parts will give an 1802 error on Post because the sub-vendor PCI ID is different, see Problem with unauthorized MiniPCI network card for more details

Also known (in IBM literature) as....


  • Linux has the ipw3945 and the iwl3945 drivers. iwl3945 should be used as it is newer and actively developed. Also, Kernel 2.6.24 drops the old wireless-stack so ipw3945 won't compile.

Hardware switch

Some ThinkPads have a hardware switch that must be in the on position for the radio to work, regardless of driver state:

(ThinkPad R60 radio switch in the ON position)

If it is off, you might encounter following Log-Message on Startup:

 ipw3945: Radio Frequency Kill Switch is On:
 Kill switch must be turned off for wireless networking to work.

ThinkPads this card may be found in