Mac OS X 10.0, iBook, PowerBook: Display Brightness and Volume Keys Do Not Respond

Symptom

You press a function key (or dedicated button on some models), and the expected adjustment to display brightness or volume does not occur.

Note: The behavior of affected computers varies. On the PowerBook G4, for example, you may adjust volume using the keyboard but not display brightness. Other computers, such as the PowerBook (FireWire), may not be able to use either display or volume keys.


Solution

Update to Mac OS X 10.1. Otherwise, you may:

1. Choose System Preferences from the Apple menu.
2. Use the Displays and Sound panes in System Preferences to make the desired adjustments.

For related information, please see:

Article 106150: "Mac OS X 10.0: No Status Bar for Keyboard Volume Adjustment"