A patch was submitted to workaround it. Let's see what upstream says

** Patch added: 
"0001-ACPI-blacklist-blacklist-Win8-OSI-for-HP-Pavilion-dv.patch"
   
https://bugs.launchpad.net/hwe-next/+bug/1416940/+attachment/4332978/+files/0001-ACPI-blacklist-blacklist-Win8-OSI-for-HP-Pavilion-dv.patch

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https://bugs.launchpad.net/bugs/1416940

Title:
  [HP Pavilion dv6] Brightness control only work on the last two steps
  on 12.04.5

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