Sony VGN-SZ3HP/B User Manual page 203

What should I do if the LCD brightness of my computer screen changes?
The LCD brightness setting, adjusted with the Fn+F5/F6 keys, is temporary and this adjustment is overridden by the setting
on the VAIO Power Management tab when another power scheme is selected. To save this preference for the brightness,
follow these steps:
To do the following procedure, you must have administrator rights on your computer.
1 Click Start and then Control Panel.
2 Click Performance and Maintenance.
3 Click Power Options.
4 Select the tab for power scheme settings.
5 Select the desired power scheme from the drop-down list.
6 On the VAIO Power Management tab, select No change for LCD Brightness.
7 Click OK.
The preference for the LCD brightness adjusted with the Fn+F5/F6 keys is saved and the brightness of your computer screen
remains unchanged regardless of operating conditions.
What should I do if the external display stays blank?
If you cannot change the display output with the Fn+F7 keys, you need to change the settings for the external display with
VAIO Control Center. To change the settings, launch the VAIO Control Center, select the control item for the external
display, and then cancel the check box for enabling the automatic function to select the external display for the output. Then,
try the Fn+F7 keys to change the display output.
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Troubleshooting