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Windows 8.1 | Using a Second Screen - YouTube
How to adjust the screen brightness on a VAIO® notebook computer in Windows 8 and 8.1. | Sony AP
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Why can't I adjust the brightness of my PC running on Windows 8.1? A solution is there by changing the graphics driver but that's not a proper solution. - Quora
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screen brightness not working window 7 - windows 8 - windows 10 - for all - YouTube
Fix Can't Adjust Brightness after Upgrading to Windows 8.1/10
Fix Can't Adjust Brightness after Upgrading to Windows 8.1/10
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End of Support for Previous Versions of Windows | Microsoft
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Screen Brightness not Changing in Windows 8.1 (Fix) - Adjust Screen Brightness not Working in Laptop - YouTube
How to enable or disable the keyboard backlight feature, or change when the backlight turns off in Windows 8 and 8.1. | Sony IN