Powerbook 500 Brightness & Contrast Don't Work After PPC Upgrade

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

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.>WorkaroundDo 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.

[Previous] [Top] [Next]