Now, I use Debian 6.0.6 instead of Fedora 16/17. But I still sustain the problem of my wireless problem. If I enable/disable my laptop wireless device or my usb wifi adaptor, my laptop will panic. It seems like all the processes stop at that time and I have to restart my laptop directly. P.S. I think I installed the drivers correctly and the linux kernel may have some bugs. For example, when I unplug my usb wifi adaptor or I use this command, ifdown wlan0 I encounter this problem. Wireless Device: PCI: 03:00.0 Network controller: Broadcom Corporation BCM43225 802.11b/g/n (rev 01) USB: Bus 002 Device 005: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN