[Ubuntu 9.10] reduce the backlight brightness when on battery power is not working

[e X t 7 3]

Binary package hint: gnome-power-manager

I`ve Lenovo s10, under Ubuntu 9.04 everything works great, but under 9.10 there is not reduce backlight brightness when I`m working on battery power and I can`t change brightness level with gnome-power-manager !

[RodGer (rodger)]

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'.

[RodGer (rodger)]

ext73 can you please try to put on your panel the 'Power Manager Brightness Applet' and check if you can change the brightness using it?
Thanks

P.S.:
I just saw a new notification in my notification area that seems to be relevant.Right clicking or just clicking does nothing.When I mouse over it a message appears :
""Session active, not inhibited, screen idle. If you can see this text, your display server is broken and yoy should notify your distributor.
Please see http://blogs.gnome.org/hughsie/2009/08/17/gnome-power-manager-and-blanking-removal-of-bodges/ for more information""

[e X t 7 3 (ext73)]

Hi RodGer ... I`ve tested this one 'Power Manager Brightness Applet' and icon have a "no pass" sign, of course I can't change anything !

[da-anda (da-anda)]

Same issue on HP Compaq nc6120 with Ubuntu 9.10.

[sreenath (tacticiankerala)]

same issue on my dell studio 15 with ubuntu 9.10