you're right, the acpi codes are not interpreted: benste@vaio-fe31m:~$ acpi_listen F5 - bright down sony/hotkey SNC 00000001 00000010 sony/hotkey SNC 00000001 0000003b
F6 bright up sony/hotkey SNC 00000001 00000011 sony/hotkey SNC 00000001 0000003b
F7 display sony/hotkey SNC 00000001 00000012 sony/hotkey SNC 00000001 0000003b
F10 zoom sony/hotkey SNC 00000001 00000015 sony/hotkey SNC 00000001 0000003b
F12 sleep sony/hotkey SNC 00000001 00000017 sony/hotkey SNC 00000001 0000003b
you're right, the acpi codes are not interpreted: vaio-fe31m: ~$ acpi_listen
benste@
F5 - bright down
sony/hotkey SNC 00000001 00000010
sony/hotkey SNC 00000001 0000003b
F6 bright up
sony/hotkey SNC 00000001 00000011
sony/hotkey SNC 00000001 0000003b
F7 display
sony/hotkey SNC 00000001 00000012
sony/hotkey SNC 00000001 0000003b
F10 zoom
sony/hotkey SNC 00000001 00000015
sony/hotkey SNC 00000001 0000003b
F12 sleep
sony/hotkey SNC 00000001 00000017
sony/hotkey SNC 00000001 0000003b