WLAN causes events/0 use all CPU time

Hello,

I have recently installed openSUSE 10.2 on my Acer Aspire 3020 with a 
GigaByte WLAN card (Cardbus 802.11g, model GN-WMKG). By installation I 
followed instructions found on: http://doube.net/3023wlmi.html

What I have done so far:
1) Installed firmware for bcm43xxx (with YaST + executing 'installfw')
2) Installed rt2500 kernel modules (my WLAN card uses rt2500 chip)
3) Configured with Yast the software-controlled (!) WLAN by configuring 
both the WLAN-controller (AMBIT Microsystem Aspire 3020WLMi using 
firmware) and the WLAN card (using rt200).
4) Configured KDE to use KNetworkMangager and KWiFi

Up to this point, everything seems to work. When I insert the WLAN card, 
the power led turns on and following lines emerge in the log:
---- cut here ----
Jan 15 20:55:00 XXXXXXXXXX kernel: pccard: CardBus card inserted into 
slot 0
Jan 15 20:55:00 XXXXXXXXXX kernel: ACPI: PCI Interrupt 0000:07:00.0
[A] -> GSI 20 (level, low) -> IRQ 177
Jan 15 20:55:00 XXXXXXXXXX kernel: rt2500 1.1.0 CVS CVS 
http://rt2x00.serialmonkey.com
Jan 15 20:55:00 XXXXXXXXXX kernel: ACPI: PCI interrupt for device 
0000:07:00.0 disabled
Jan 15 20:55:00 XXXXXXXXXX kernel: ACPI: PCI Interrupt 0000:07:00.0
[A] -> GSI 20 (level, low) -> IRQ 177
Jan 15 20:55:00 XXXXXXXXXX kernel: rt2500 1.1.0 CVS CVS 
http://rt2x00.serialmonkey.com
Jan 15 20:55:00 XXXXXXXXXX kernel: ACPI: PCI interrupt for device 
0000:07:00.0 disabled
Jan 15 20:55:00 XXXXXXXXXX NetworkManager: <debug> [1168887300.387790] 
nm_hal_device_added(): New device added (hal udi 
is '/org/freedesktop/Hal/devices/pci_1814_201').
Jan 15 20:55:26 XXXXXXXXXX kernel: bcm43xx: set security called, .level 
= 2, .enabled = 1, .encrypt = 1
Jan 15 20:55:26 XXXXXXXXXX kernel: bcm43xx: set security called, .level 
= 4, .enabled = 1, .encrypt = 1
Jan 15 20:55:27 XXXXXXXXXX kernel: bcm43xx: set security called, .level 
= 2, .enabled = 1, .encrypt = 1
Jan 15 20:55:27 XXXXXXXXXX kernel: bcm43xx: set security called, .level 
= 4, .enabled = 1, .encrypt = 1
Jan 15 20:55:37 XXXXXXXXXX kernel: bcm43xx: set security called, .level 
= 2, .enabled = 1, .encrypt = 1
Jan 15 20:55:37 XXXXXXXXXX kernel: bcm43xx: set security called, .level 
= 4, .enabled = 1, .encrypt = 1
Jan 15 20:56:03 XXXXXXXXXX kernel: bcm43xx: set security called, .level 
= 2, .enabled = 1, .encrypt = 1
Jan 15 20:56:03 XXXXXXXXXX kernel: bcm43xx: set security called, .level 
= 4, .enabled = 1, .encrypt = 1
Jan 15 20:57:36 XXXXXXXXXX kernel: SoftMAC: Start scanning with channel: 
1
Jan 15 20:57:36 XXXXXXXXXX kernel: SoftMAC: Scanning 14 channels
Jan 15 20:57:36 XXXXXXXXXX kernel: SoftMAC: Scanning finished
---- cut here ----

After this, the computer starts to slow down and finally freezes. 
Ejecting the WLAN card brings the computer back to life.

When I started 'top' before inserting the WLAN card I noticed that after 
having inserted the card the process 'event/0' was eating up the whole 
CPU time and driving the CPU load to 100%. 

I really do not know how to make my WLAN work and would appreciate any 
hints! Many thanks in advance!

Kind regards,
Kimmo