最近不知道为什么，我x200总是会出现无线崩溃的情况。就算你用下面这条命令，得到的居然是设备忙…
$ sudo iwlist can
lo Interface doesn't support scanning.
eth0 Interface doesn't support scanning.
pan0 Interface doesn't support scanning.
wmaster0 Interface doesn't support scanning.
wlan0 Interface doesn't support scanning : Device or resource busy
lo Interface doesn't support scanning.
eth0 Interface doesn't support scanning.
pan0 Interface doesn't support scanning.
wmaster0 Interface doesn't support scanning.
wlan0 Interface doesn't support scanning : Device or resource busy
没办法，只好试着把驱动删除，然后再重新加载
用下面命令删除相关的无线模块：
# modprobe -r iwlagn
# modprobe -r iwlcore
# modprobe -r mac80211
# modprobe -r iwlcore
# modprobe -r mac80211
用下面命令重新加载无线模块
# modprobe mac80211
# modprobe iwlcore
# modprobe iwlagn
# modprobe iwlcore
# modprobe iwlagn
根据无线网卡型号的不同，上述模块名应该会有不同，附上我的无线网卡型号做参考
03:00.0 Network controller: Intel Corporation Wireless WiFi Link 5300