The "solution" in my case is: modprobe -r iwl3945 > wifi button off (I have a physical button) > standby (suspend to ram) > power on the computer > wifi switch on > modprobe iwl3945
The "solution" in my case is: modprobe -r iwl3945 > wifi button off (I have a physical button) > standby (suspend to ram) > power on the computer > wifi switch on > modprobe iwl3945