6.1. Screen Dim Brightness
You can change the idle laptop panel brightness by changing the GConf key /apps/gnome-power-manager/backlight/idle_brightness.
6.2. Screen Locking
By default, GNOME Power Manager supports a simple locking scheme. This means that the screen will lock if set to "Lock screen" in gnome-screensaver when the lid is closed, or the system performs a suspend or hibernate action.
There is a complex locking scheme available for power users that allows locking policy to change for the lid, suspend and hibernate actions. To enable this complex mode, you will have to disable the GConf key:
Then the policy keys can be set to force a gnome-screensaver lock and unlock when the action is performed:
The lock policy for gnome-screensaver is ignored until the simple mode is re-enabled.