According to 
https://bugs.launchpad.net/stella/hwe-stella/+bug/1023760/comments/13 ,
the backlight function should work on 12.04 if BIOS fixed this issue.

But backlight function is still broken on 12.04(amd64, i386), 11.04 and
14.04.

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https://bugs.launchpad.net/bugs/1152544

Title:
  HP Envy 23 AIO - No way to dim display

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