I've tested kernel from v3.8-rc4-raring directory in 
http:/http://kernel.ubuntu.com/~kernel-ppa/mainline/. 
With workaround ("acpi_osi=") hot keys work just as when I use kernel 3.5 from 
Xubuntu 12.10. But when I delete these symbols, then do "update-grub2" in 
terminal and reboot, the situation remains the same as I have not used new 
kernel,so that Fn+F5/F6 combinations can't adjust brightness.

** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1103620

Title:
  Adjusting brightness with hot keys doesn't work properly on Asus K55VD

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