https://bugzilla.kernel.org/show_bug.cgi?id=45061
--- Comment #7 from Peter lekensteyn@gmail.com 2012-10-05 20:00:56 --- Thank you for letting me know. My VGA button (for switching between performance and powersave mode) is also implemented as a software solution. When pressed, a WMI ACPI event is generated which is processed by the Hotkey.exe program in Windows. I guess yours works in a similar way.
Btw, are you able to test the aforementioned suspend/resume cycle in windows?