You have been subscribed to a public bug:
In Karmic Koala Alpha 5, the Power Manager Brightness Applet has a red
cross over it and the tooltip text says: "Cannot get laptop panel
brightness". Therefore, I cannot set the brightness of the display using
this tool. Also, the brightness does not change when I plug the laptop
into an AC outlet like it did in 9.04. I suspect this has something to
do with HAL deprecation in 9.10. Howewer, I can manually set the
brightness using the FN + F9/F10 keys.
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
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Can't set display brightness on Compaq tc4200 in Karmic Koala Alpha5
https://bugs.edge.launchpad.net/bugs/426450
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