See: #291878 and #295251 .
Those Bugs describe similar Problems. As the Kernel Log already suggests, one 
can setup the keys with setkeycodes, for instance in 
/usr/share/hotkey-setup/samsung.hk . 

But even though the Keys are then recognized, pressing a key such as
Backlight + or Backlight - the kernel, X11 or whatever thinks one keeps
pressing/releasing that button for ever.

Possibly an adapted kernel patch like the one supplied there will work
for the R560 as well.

Greetings
 Alexander

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Samsung r560: can't adjust brightness of laptop screen
https://bugs.launchpad.net/bugs/269960
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