Public bug reported:

Power Manager Brightness Applet 2.21.1 on Hardy Current Alpha 4Power
Manager Brightness Applet 2.21.1 on Hardy Alpha 4 (up-to-date) Intel
32-bit.

Exact message: "cannot get laptop panel brightness"

This message has appeared since first install of Alpha 4. It appears on
first boot, reboot, restart of x server, etc.

I can not manage my display brightness using the keyboard, screen or any
other method. I do not think the display and the kernel communication?

It seems that my laptop (IBM Lenovo Z60m) is able to change the
brightness settings in the Bios HOWEVER once I boot into Linux this
program referenced above (Brightness Applet in Gnome) does not properly
talk to ACPI, HAL or anything else.

It means that the system does not know, and cannot change, the
brightness of the monitor.

[EMAIL PROTECTED]:~$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=8.04
DISTRIB_CODENAME=hardy
DISTRIB_DESCRIPTION="Ubuntu hardy (development branch)"

Gnome Power Applets
Power Manager Brightness Applet 2.21.1

** Affects: ubuntu
     Importance: Undecided
         Status: New

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can not get brightness (gnome brightness applet)
https://bugs.launchpad.net/bugs/191161
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