[Bug 82188] Brightness control via ACPI in HP notebooks

[grybba]

Public bug reported:

I own a HP notebook model nx7400 EY505ES with BIOS F.08 and neither ubuntu edgy nor feisty recognizes the brightness control of the built in LCD.  The brightness of the LCD can be easily changed via writing to the file:
/proc/acpi/video/C080/C13F/brightness. The file contains:
levels:  100 51 30 37 44 51 58 65 72 79 86 93 100
current: 51
The brightness can be changed via issuing
sudo bash
echo 51 > brightness
The numbers echoed into the file have to come from the list, and the number 100 is impossible to enter this way. Is there a way to make the ubuntu aware of these possibility?

** Affects: hal (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
Brightness control via ACPI in HP notebooks
https://launchpad.net/bugs/82188