Comment 5 for bug 145377

Try putting the pcmcia and yenta_socket modules in the blacklist
[ In the file /etc/modprobe.d/blacklist append
blacklist pcmcia
blacklist yenta_socket
] and reboot.
Don't try unloading them, you need to not load them at all.
This will obviously disable pcmcia, but if you don't use it then you will save power.
If you want to use it once in a while just load the modules by hand
[ sudo modprobe pcmcia yenta_socket].
I will do some search to see what is the exact module to blame (these ones depend on others)