I can confirm this. It seems like there is no access to the display
brightness information due to a lack of suitable driver. I believe it is
a hardware specific problem as there is no such problem on my
girlfriend's laptop (as I can remember right now). On my laptop there is
also an other instance of the same problem: the panel applet named
'Power Manager Brightness Applet 2.28.1' appears with a red prohibitive
sign and when I mouse over it, it says 'cannot get laptop panel
brightness'.
** Changed in: gnome-power-manager (Ubuntu)
Status: New => Confirmed
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[Ubuntu 9.10] reduce the backlight brightness when on battery power is not
working
https://bugs.launchpad.net/bugs/484715
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