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I updated Intrepid kernel to 2.6.27-11 and the brightness adjusting feature 
stopped working.
I tried cat /proc/acpi/video/VGA/LCD/brightness and i got <not supported>
now i'm using 2.6.27-10 and the feature works again and when i do cat 
/proc/acpi/video/VGA/LCD/brightness i get:
levels:  100 60 20 28 36 44 52 60 68 76 84 92 100
current: 100

both kernels are "generic"

laptop is an HP DV 2840 SE

regards

** Affects: gnome-power-manager (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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screen brightness control stopped working with 2.6.27-11
https://bugs.launchpad.net/bugs/315255
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