Hello, it appears that this is an issue with HAL rather than guidance- power-manager, one of the scripts which is executed when attempting to change the screen brilliance via HAL is broken under Edgy because it relies on Bash features, but Edgy uses dash to execute scripts by default
https://bugs.launchpad.net/distros/ubuntu/+source/gnome-power- manager/+bug/65028 -- Screen brightness not altered when AC adapter is unplugged https://launchpad.net/bugs/72120 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs