HOWTO: Enable wireless with ipw2200
# iwconfig ethX txpower on
where X is the number of your device. Once this command is issued you should see "radio on" in the details for your wireless adapter if you issue an iwconfig command. By default Sabayon does not turn on the device. Its is unknown if there are plans to fix this in future versions.
if you want to have it done whenever you start Sabayon Linux, you can create a small script that will do it for you: create a file with you favorite text editor where you'll put those lines es.
# nano -w radioon
#!/bin/bash iwconfig ethX txpower on
where X is the number of the device.
Once done copy that file in /usr/bin/
# cp radioon /usr/bin/radioon
and as root do:
# chmod 755 radioon
and then add it to the boot with rc-update add radioon