I am quite interested in WWAN support. My previous findings were reported on http://www.coreboot.org/pipermail/coreboot/2014-September/078538.html

At the moment, using a branch based on a  libreboot5, along with patch #4056, it works quite well, but I do not have rfkill support (cf http://www.coreboot.org/pipermail/coreboot/2014-September/078542.html) or any way to turn WWAN off.

Basically, there is no WWAN rfkill entry if you do "rfkill list"

Also, I noticed that while rfkill block 0 does turn off the wifi led,  rfkill block for bluetooth does not turn turn off its led (or even echo '5-2' > /sys/bus/usb/drivers/usb/unbind)

My belief is some ACPI entries are missing to handle that.

I am going back into the ACPI table investigation, but I'm curious whether anyone has had good results with WWAN, ie :
 - if rfkill shows a WWAN entry
 - if rfkill block reduces power consumption (cf /proc/acpi/battery/BAT0/state) and turns off the LED.

I would also be interested to know if rfkill block bluetooth does turns off the LED (the power consumption change might be too low to be noticeable)