Home
Table Of Contents
Support Pages
Feedback & Contact
Apple Computer, Inc.
Mirror Sites
Huh?
TECHINFO-0020113
TOPIC
After upgrading my Powerbook 500 series computer with the Power PC upgrade the brightness and contrast buttons no longer have any effect when it is starting up. This only happens when I start from the battery, not when it is plugged into the AC power.
DISCUSSION
Issue
When using system software older than 7.5.5 on a Powerbook 500 series computer with the Power PC upgrade, the Display Brightness control push button does not work unless AC Power is connected.If you adjust the brightness or contrast while the unit is starting up, and running from the battery, those controls will become locked in at the current brightness/contrast setting.
Workaround
Do not adjust brightness or contrast until the unit fully comes up to the desktop. If you wait until the computer is finished starting up to make adjustments, the brightness and contrast buttons will work normally.
Resolution
System Software 7.5.5
System Software 7.5.2 v 1.2 is the version of system software which originally shipped with the Powerbook 500 series computer Power PC upgrade. Installing System Software version 7.5.5 fixes display brightness issue.
Alternate Solution
Newer Technology has created a system extension that corrects this issue. It is called NUpowr Backlight Fix and can be found on the internet at www.newertech.com on the Free Software page.**NOTE: This article provides information about a non-Apple product. Apple Computer, Inc. is not responsible for its content. Please contact the vendor, Newer Technology, for additional information.
The Tech Info Library article titled "Locating Vendor Information" can help you search for a particular vendor's address and phone number. 
[Previous] [Top] [Next]
