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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
Screen Brightness not Changing in Windows 8.1 (Fix) - Adjust Screen Brightness not Working in Laptop - YouTube
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
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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
Solved - Brightness won't adjust after Windows 8.1 Update | Windows 8 Help Forums
Windows 8.1 | Using a Second Screen - YouTube
Disable auto brightness - Lenovo Support GD
I accidentally turned my brightness all the way down on my laptop yesterday what do I do? It's completely black. - Quora