Backlight brightness on linux kernel 2.6.28

[Sergey I. Sharybin]

Hi,

I'm using Debian GNU/Linux (Lenny) on my notebook (model HP 6720s) and 
since linux kernel version 2.6.28 there is a trouble with backlight 
brightness: after notebook has been just booted brightess is easily 
controlled by hotkeys, but if the external power state is changed 
(plugged or unplugged) there is no more way to control the brightess of 
backlight until the system reboot. There is the same trouble under 
kernel version 2.6.29. And there is no such problems with kernel version 
<= 2.6.27.

Is it trouble of kernel or software problem in my Debian system and what 
can be done with it?

--
With best regards, Sergey I. Sharybin

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