You caan recalibrate automatic brightness. Turn autobrightness off, then turn it on. It will select a brightness level according to light that comes to light sensonr on top of the screen. Now, if you increase brightness at this stage, you can increase light calibrationn so that the screen brightness for the same light that comes onto light sensor would give a higher screen brightness than earlier.
Step by step:
1. Turn off autobrightness
2. Turn on autobrightness
3. Increase brightness manually (to any level)
4. Calibration is done.