Comment 41 for bug 178286

I was able to isolate the issue down to partially to a specific driver: hci_usb which is loaded as part of the bluetooth driver initialization. If this driver is unloaded, and the machine is started with the wireless kill switch set to off, then turned on, and then put back to off, it will successfully suspend/resume.

I've managed to get it to fully work by adding hci_usb to the modules list in /etc/default/acpi-support. As long as I have wireless switched to off when I start the machine, and I turn it off before suspending it works properly.

The switch causes a bluetooth USB dongle to appear in dmesg when flipped on, and it disappears when flipped off.The onboard WWAN card may also be loading/unloading with this switch.