CentOS 5 Hardware :: 5.6, Iwlcore, Blinking Led On A Thinkpad T400?

I've just successfully updated a Thinkpad T400 from 5.5 to 5.6 with no problems.In fact, the wireless led indicator now works, which is kind of neat. What's annoying is that it blinks whenever there is network traffic.Perhaps I'll get used to it, but if I can just make it "on" when the network is on and "off" when the network is off, that would be better.Googling turns up this issue on ubuntu and other distros in the past year or so, and the recommended fix was to add the following line to /etc/modprobe.d/iwlcore.conf

options iwlcore led_mode=1

I did this, unloaded and reloaded the kernel modules, but to no avail. Output was:

[cbender@kauai modprobe.d]# rmmod iwlagn
[cbender@kauai modprobe.d]# rmmod iwlcore
[cbender@kauai modprobe.d]# modprobe iwlagn[code].........