Comment 14 for bug 253874

@zl0i
Could you try the "empty fn key" with the following step:

1) dmesg | grep GPE
  will show you something like "ACPI: EC: GPE = 0x11, I/O: command/status = 0x66, data = 0x62"

2) cat /sys/firmware/acpi/interrupts/gpe11
  use the number in 1)

3) press fn keys and cat again to see if the number increases