ASUS M9V，intel2200BG的无线网卡在ubuntu下开关问题

rash

先说一下我的机子：ASUS M9V，自己加装的intel2200BG的无线网卡。
安装完ubuntu之后，无线网卡无法打开。机器本身自带的无线开关失效，怎么按都没用，无线网络的指示灯也是黑的。

参照论坛里的一些帖子，做了如下：
iwconfig
eth1 radio off ESSID:"it@xmulib"
Mode:Managed Channel:0 Access Point: Not-Associated
Bit Rate:0 kb/s Tx-Power=off Sensitivity=8/0
Retry limit:7 RTS thrff Fragment thrff
Power Managementff
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

iwconfig ech1 power on
Error for wireless request "Set Power Management" (8B2C) :
SET failed on device eth1 ; Operation not permitted.

dmesg | grep ipw
[ 129.859984] ipw2200: Intel(R) PRO/Wireless 2200/2915 Network Driver, 1.2.2
[ 129.859988] ipw2200: Copyright(c) 2003-2006 Intel Corporation
[ 129.860097] ipw2200: Detected Intel PRO/Wireless 2200BG Network Connection
[ 131.226173] ipw2200: Radio Frequency Kill Switch is On:
[ 131.226307] ipw2200: Detected geography ZZM (11 802.11bg channels, 0 802.11a channels)

请大家帮忙分析原因