Comment 4 for bug 6628

To get Fn keys working on the vaio FS searies you need to patch the sony_acpi driver adding

ony_acpi_values[] = {
...
 {
  .name = "fnkey",
  .acpiget = "GHKE",
  .debug = 0,
 },
...
}

which will create a /proc/acpi/sony/fnkey entry

and then need a small daemon or something like that that polls the file. I am not sure if there is a standard program for this kind of thing (I recall it was discussed on the HAL list, but I don't think it has been done)

http://developer.berlios.de/projects/fsfn/ seems to have this small daemon, but I haven't bothered testing it. I tested out the above kernel modification and it works, the proc files assumes the values 1, 2, 4, etc every time a Fn+Key combination is pressed.