我的笔记本网卡是Intel(R) PRO/Wireless LAN 2100 3B Mini PCI Adapter，在Bios里面wireless已经enabled了，XP下可以正常连上无线网络，但在ubuntu8.10下可以识别到网卡，但无法搜索到网络，无线网络是open的，没有密码，ssid也有广播

iwconfig的结果是这样的:
lo no wireless extensions.

eth0 unassociated ESSID:off/any Nickname:"ipw2100"
Mode:Managed Channel=0 Access Point: Not-Associated
Bit Rate:0 kb/s Tx-Power:off
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
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

eth1 no wireless extensions.

# iwconfig eth0 channel 1
Error for wireless request "Set Frequency" (8B04) :
SET failed on device eth0 ; Operation not supported.

cat /sys/bus/pci/driver/ipw2100/0000:02:06.0/rf_kill，结果是2
echo 0> /sys/bus/pci/driver/ipw2100/0000:02:06.0/rf_kill无效，怎么改都是2

iwlist eth0 scanning 没有找到任何网络