Sony VAIO VGN-A700 - Manual (Page 191)

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Troubleshooting
What should I do if the brightness of the screen changes?
The brightness of your screen when adjusted with the Brightness button and 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
✍
To do the following procedure, you must have administrator rights.
1 Click Start and then Control Panel.
2 Click Performance and Maintenance.
3 Click Power Options.
4 On the Power Schemes tab, select the desired power scheme from the Power schemes list.
5 On the VAIO Power Management tab, select No change under Plugged in and Running on batteries for LCD Brightness.
6 Click OK.
The preference for the brightness adjusted with the Brightness button or the Fn+F5/F6 keys is saved and your screen brightness
remains unchanged regardless of operating conditions.
What should I do if the external display (or TV) does not display anything?
If you change the log-on user with the Fast User Switching function after your computer started, you will not be able to select a
display by pressing the Fn+F7 keys.