Brightness Slider Not Working Windows 11 Fix [2026]

Quick Answer: Brightness not working due to missing PnP monitor driver or generic display driver. Update display adapter and monitor drivers.

Fix

Device Manager → Display adapters → Update driver

Device Manager → Monitors → Generic PnP Monitor → Enable if disabled

Settings → System → Display → Brightness → Ensure not set to automatic

Device Manager → Monitors → Generic PnP Monitor → Update driver

Againly runs check_display_topology to detect display driver issues.

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Works on Windows 10 & 11 • No credit card required