Same here on 12-RELEASE-p2, although do not have experience with 11-STABLE, as I just got this Thinkpad.
Also when I hit the Fn key it goes to sleep (I am not touching other keys like F4). I have enabled acpi_ibm and acpi_video (I do not know if this is still valid?). Also this model has Optimus, but I disabled it in the BIOS and using the discrete graphics NVIDIA at the moment.
Suspend works as expected in my T430 with 12.0-RELEASE.
I have acpi_ibm.ko loaded and use acpiconf -s 3 to suspend.
I cannot check em0 right now, but wlan0 perfectly works after resume.
No Fn-key problem, however, I use it to wake the laptop when it sleeps with open lid.
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