For me (on a R60+, as mentioned above) it is:

[  114.681006] atkbd.c: Unknown key pressed (translated set 2, code 0x88 on 
isa0060/serio0).
[  114.681006] atkbd.c: Use 'setkeycodes e008 <keycode>' to make it known.
[  115.279328] atkbd.c: Unknown key pressed (translated set 2, code 0x89 on 
isa0060/serio0).
[  115.279328] atkbd.c: Use 'setkeycodes e009 <keycode>' to make it known.

So Samsung seems to disable these keys also in other models. Do you have
the "disable backlight button" (Fn+F4)? Does it work? For me it doesn't:

[  242.132450] atkbd.c: Unknown key pressed (translated set 2, code 0x84 on 
isa0060/serio0).
[  242.132450] atkbd.c: Use 'setkeycodes e004 <keycode>' to make it known.

Or can you disable WLAN (Fn+F9) (there's also a led on the front of the
laptop). For me, it's broken, too:

[  298.608234] atkbd.c: Unknown key pressed (translated set 2, code 0x86 on 
isa0060/serio0).
[  298.608234] atkbd.c: Use 'setkeycodes e006 <keycode>' to make it known.

The brightness keys can be easily fixed, it only requires mapping these
keys to a program which modifies the brightness (via writing to
/proc/acpi/video/ATIM/LCD/brightness or whatver your display is), but
the other features are not modifiable via /proc as far as I know.

-- 
backlight brighness control does not work (Samsung Q45 with Nvidia GForce 8400M)
https://bugs.launchpad.net/bugs/146710
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