When I try to connect to any wifi network using NetworkManager I get following error:
NetworkManager: <info>  Error getting killswitch power arguments: org.freedesktop.DBus.Error.InvalidArgs - Argument 0 is specified to be of type "uint32", but is actually of type "int32"

and NetworkManager fails to connect.

Additional info:
# hwinfo --wlan
20: PCI 200.0: 0282 WLAN controller
  [Created at pci.301]
  UDI: /org/freedesktop/Hal/devices/pci_8086_4222
  Unique ID: JNkJ.trkNZjh+GB2
  Parent ID: z8Q3.yjCEx5JbDxB
  SysFS ID: /devices/pci0000:00/0000:00:1c.0/0000:02:00.0
  SysFS BusID: 0000:02:00.0
  Hardware Class: network
  Model: "Hewlett-Packard Company PRO/Wireless 3945ABG Network Connection"
  Vendor: pci 0x8086 "Intel Corporation"
  Device: pci 0x4222 "PRO/Wireless 3945ABG Network Connection"
  SubVendor: pci 0x103c "Hewlett-Packard Company"
  SubDevice: pci 0x135c
  Revision: 0x02
  Driver: "ipw3945"
  Driver Modules: "ipw3945"
  Device File: eth1
  Features: WLAN
  Memory Range: 0xf8000000-0xf8000fff (rw,non-prefetchable)
  IRQ: 16 (no events)
  HW Address: 00:1b:77:89:7b:30
  Link detected: yes
  WLAN channels: 1 2 3 4 5 6 7 8 9 10 11 12 13 34 36 38 40 42 44 46 48 52 56 60 64 100 104 108 112 116 120 124
  WLAN frequencies: 2.412 2.417 2.422 2.427 2.432 2.437 2.442 2.447 2.452 2.457 2.462 2.467 2.472 5.17 5.18 5.19 5.2 5.21 5.22 5.23 5.24 5.26 5.28 5.3 5.32 5.5 5.52 5.54 5.56 5.58 5.6 5.62
  WLAN bitrates: 1 2 5.5 11 6 9 12 18 24 36 48 54
  WLAN encryption modes: WEP40 WEP104 TKIP CCMP
  WLAN authentication modes: open sharedkey wpa-psk wpa-eap
  Module Alias: "pci:v00008086d00004222sv0000103Csd0000135Cbc02sc80i00"
  Driver Info #0:
    Driver Status: ipw3945 is active
    Driver Activation Cmd: "modprobe ipw3945"
  Driver Info #1:
    Driver Status: iwl3945 is not active
    Driver Activation Cmd: "modprobe iwl3945"
  Config Status: cfg=no, avail=yes, need=no, active=unknown
  Attached to: #7 (PCI bridge)

# uname -a
Linux grek-j5qa 2.6.22.5-23-default #1 SMP 2007/09/18 05:23:45 UTC i686 i686 i386 GNU/Linux