Alright guys, I'm no expert at all and basically tried to hack myself
through the scripts, and now I'm not completely sure what I actually
changed... but anyway, I *think* in /etc/acpi/events/sony-brightness-
down it originally read:

event=sony/hotkey SPIC 00000001 00000010

However, when I use acpi_listen and the corresponding button, I get

sony/hotkey SNC 00000001 00000010

Note it reads SNC, not SPIC (whatever that means). I now changed SPIC to
SNC in /etc/acpi/events/sony-brightness-down, and suddenly I can adjust
my brightness with the corresponding keys (while still referring to the
original /sonybright.sh as event)!

So is that the whole problem after all? I'm confused...

-- 
unable to adjust screen brightness on recent Sony Vaio notebooks
https://bugs.launchpad.net/bugs/173652
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