Ooops , looks like a firmware trouble with old (!) laptops.

root@bt:~# rmmod ipw2200
root@bt:~# modprobe ipw2200
root@bt:~# dmesg -c
[ 1801.364452] ipw2200: Intel(R) PRO/Wireless 2200/2915 Network Driver, 1.2.2kmprq
[ 1801.364457] ipw2200: Copyright(c) 2003-2006 Intel Corporation
[ 1801.364562] ipw2200 0000:06:05.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
[ 1801.364636] ipw2200: Detected Intel PRO/Wireless 2200BG Network Connection
[ 1801.366506] ipw2200: ipw2200-bss.fw request_firmware failed: Reason -2
[ 1801.366511] ipw2200: Unable to load firmware: -2
[ 1801.366515] ipw2200: failed to register network device
[ 1801.369176] ipw2200 0000:06:05.0: PCI INT A disabled
[ 1801.369215] ipw2200: probe of 0000:06:05.0 failed with error -5
root@bt:~# locate ipw2200-bss.fw

I'll post solutions (=where to find the right bss.fw) when I'll find it !
B