Sony VGN-FW170J - Manual (Page 159)

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Troubleshooting
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On models with an ATI video controller, you may find your computer screen temporarily goes blank:
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When you connect or disconnect the AC adapter
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Immediately after you start the computer with battery power
To save your preference for the brightness, follow these steps:
1 Click Start and Control Panel .
2 Click Hardware and Sound .
3 Click Change when the computer sleeps under Power Options .
4 Click Change advanced power settings .
5 Scroll down the list and double-click ATI Graphics Power Settings .
6 Double-click ATI PowerPlay Settings .
7 Change the current option for On battery to Maximum Performance .
8 Click OK .