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How to Fix the Windows 10 Brightness Slider Not Working
If the Windows 10 brightness slider is not working, first check whether you are controlling the laptop's built-in screen or an external monitor. Microsoft says the Windows brightness slider is intended for supported built-in displays; many external monitors must be adjusted with the monitor's own buttons. On a laptop or all-in-one PC, an unresponsive slider is worth troubleshooting through the display driver and monitor device.
Windows 10 reached end of support on October 14, 2025. These steps still apply, but Microsoft recommends moving to Windows 11 when possible or using an eligible Extended Security Updates option. See Microsoft's Windows 10 support notice.
Start with the normal brightness controls
Open Settings > System > Display and move the brightness slider. You can also open Action Center from the taskbar and move its brightness control. If your laptop has dedicated brightness keys, test those too.
If the slider is missing on a desktop connected only to an external monitor, that can be normal. Microsoft's display brightness guide says external monitors may require their own controls.
1. Reset the graphics driver
Press Windows+Ctrl+Shift+B. Windows resets the graphics driver, and the screen may briefly flicker or go dark. Microsoft recommends this shortcut as an early display troubleshooting step. If brightness starts working afterward, no further change may be needed.
2. Update the display driver
Right-click Start, open Device Manager, expand Display adapters, right-click a display adapter, and choose Update driver. Select Search automatically for drivers. If more than one display adapter is listed, check each one.
Microsoft says Windows Update is normally the preferred source for recommended driver updates. Avoid third-party driver-download sites; if Windows cannot find a suitable driver, use the PC or graphics hardware manufacturer's official support page. Microsoft's Device Manager driver guide covers automatic and manual installation.
3. Roll back the display driver after a bad update
If brightness stopped working after a Windows or graphics-driver update, open the display adapter's Properties, select the Driver tab, and choose Roll Back Driver. Restart when prompted. If the button is unavailable, Windows does not have a previous driver package to restore.
4. Reinstall the display adapter
If updating or rolling back does not help, open Device Manager > Display adapters, right-click the adapter, and select Uninstall device. Restart Windows afterward. Microsoft says Windows will attempt to reinstall the driver after the restart, so save your work first.
5. Check the monitor device in Device Manager
Expand Monitors. If the built-in display or Generic PnP Monitor entry is disabled, right-click it and choose Enable device. If the monitor entry is missing, use Action > Scan for hardware changes. There is no need to disable a monitor that is already working normally.
6. Test with automatic brightness turned off
On PCs with an ambient-light sensor, go to Settings > System > Display and, if available, turn off Change brightness automatically when lighting changes for testing. Microsoft notes that manual adjustment should still work when automatic brightness is enabled, so this step is more useful when brightness changes unexpectedly than when the slider is missing.
7. Use the monitor's controls for an external display
If the only active display is external, use the monitor's physical buttons, joystick, or on-screen menu to change brightness. For connection problems, Microsoft's external-monitor troubleshooting guide also recommends restarting, resetting the graphics driver, and rolling back a display driver when an update caused the issue.
Avoid unsupported registry fixes
Do not change undocumented FeatureTestControl registry values unless your PC manufacturer specifically documents that change for your exact model. Microsoft's current brightness guidance focuses on supported display settings and driver repair, and a wrong registry edit can create additional problems.
If the brightness slider still does not work
If the built-in display is detected and a clean display-driver reinstall still does not restore brightness control, check your laptop maker's support page for a model-specific graphics, chipset, or hotkey package. A persistent failure can also indicate firmware, sensor, panel, or other hardware trouble.
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