1. "And how can I... bind Fn keys... via ...acpi" :
If this doesn't work out of the box for you, I am pessimistic about make it 
work. But we can try :
 - in a terminal window, run the 'acpi_listen' command
 - press your brightness up and brightness up key
 - copy the lines printed (here it is :
sony/hotkey SPIC 00000001 00000010
sony/hotkey SPIC 00000001 0000003b
sony/hotkey SPIC 00000001 00000011
sony/hotkey SPIC 00000001 0000003b
 - if acpi_listen doesn't print anything, so the acpi events are invisible to 
linux and there's nothing to do
 - else edit the /etc/acpi/events/sony-brightness-up and 
/etc/acpi/events/sony-brightness-down by replacing the line with the correct 
event : for me :
sony-brightness-down: event=sony/hotkey SPIC 00000001 00000010
sony-brightness-up:event=sony/hotkey SPIC 00000001 00000011

2. I'm currently updating my packages with the yleetiny

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LCD brightness setting doesn't work with Sony Vaio VGN-S5M
https://bugs.launchpad.net/bugs/77739
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