I may be wrong, but I have the feeling that the newest Nvidia drivers
(177.80, which is only the latest ubuntu packaged version in fact) may
have changed something and made your modifications ineffective. The
fn+F5-6 don't work anymore, I have to enter the nvclock commands
manually. (which is still usable of course)

The fn shortcuts now segfault, as seen in dmesg output:
nvclock[5526]: segfault at 0 ip b7dde2c3 sp bf9f4cfc error 4 in 
libc-2.8.90.so[b7d67000+158000]

The only other segfault I could find via google with error 4 in
libc-2.8.90.so was also an nvidia driver bug report, so that's that.

I'll try removing your mods to see if it changes anything Shawe.

Also, it would be good if we could have someone in charge, be it of
Nvidia integration or of acpi, to give us some heads up as to what to do
to get this bugfix working and taken in consideration (and pardon my
lack of knowledge concerning linux bug squishing).

-- 
No Screen Backlight Control; Sony Vaio with nvidia 8 series graphics
https://bugs.launchpad.net/bugs/95444
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