Do these 3 things before closing this tab: To adjust screen brightness on Windows 10, open Start > Settings > System > Display and move the Change brightness slider. On Windows 10 version 1903 and later, you can also open Action Center from the taskbar notification icon and move its brightness slider, provided Windows supports the display. On a supported built-in display, use Start > Settings > System > Display , then move the Change brightness slider. Windows 10 version 1903 and later also provide a brightness slider in Action Center . A missing Windows brightness slider often means the computer is using an external monitor, whose brightness is normally adjusted with the monitor’s own buttons or on-screen menu. If the slider is missing or does nothing on a laptop, install Windows updates and update the display adapter through Device Manager before trying more advanced repairs. Automatic brightness can be disabled under Settings > System > Display when the PC provides the relevant lighting-based setting. Windows 10 Home and Pro reached end of mainstream support on October 14, 2025, although the brightness controls still work on compatible installations. How to adjust screen brightness on Windows 10 On a Windows 10 laptop or all-in-one PC with a supported built-in display, open Start > Settings > System > Display and move the Change brightness slider. If the slider is unavailable or ineffective, identify whether you are using an external monitor, automatic brightness, a display-driver problem, or an HDR and power-state issue. Open Settings . Select System , then Display . Under the display brightness section, drag the Change brightness slider left or right. Microsoft’s official Windows brightness instructions describe this as the normal software control for a supported built-in display. How do you change brightness from Action Center? On Windows 10 version 1903 and later, select the notification icon on the right side of the taskbar to open Action Center , then move the Brightness slider. Microsoft states, “The Brightness slider appears in action center in Windows 10, version 1903.” Free tools Windows power users keep installed One-click scans. No signup required. If the brightness control is not visible in Action Center, expand the quick actions area if an Expand option is shown. The Action Center slider is an alternative to the Display settings route; it does not add brightness control to an external monitor that Windows cannot control. Which brightness method should you use? Why is there no brightness slider on Windows 10? The most common explanation is that Windows is displaying an external monitor. Microsoft warns that the brightness slider may not appear on desktop PCs with external monitors because Windows often does not control the monitor’s backlight through the standard laptop brightness interface. Use the monitor’s physical buttons or its on-screen display menu instead. Look for buttons along the bottom, side, or rear of the monitor, then open the monitor menu and select Brightness , Picture , or a similar display option. The exact button names and menu layout depend on the monitor. If you are using a laptop’s built-in screen and the slider is missing, continue with the troubleshooting steps below rather than assuming that a new monitor or accessory is required. What should you do when the Windows 10 brightness slider is not working? When a laptop brightness slider is present but does nothing, or when the slider disappears from Display settings, work through the following sequence. The sequence starts with reversible checks and leaves driver repair for after you confirm that the display is built in. 1. Confirm which display you are trying to control Disconnect the external monitor temporarily, if practical, and test the laptop’s built-in panel. If brightness changes only fail on the external monitor, use that monitor’s hardware controls. If brightness fails on the built-in panel as well, continue to the update and driver steps. 2. Check automatic brightness If the screen keeps dimming, brightening, or ignoring the level you selected, open Settings > System > Display . Look for Change brightness automatically when lighting changes and clear or disable it if the option is present. The automatic-brightness setting depends on the PC’s hardware, so the setting is not available on every Windows 10 computer. Disabling the setting is low risk and reversible: return to the same Display page and enable it again if preferred. 3. Install Windows updates Check Settings > Update & Security > Windows Update and install available updates. Restart the PC after updates finish, then test the brightness control. Windows 10 is no longer in mainstream support, so available update coverage depends on the device’s servicing status and any applicable extended-support arrangement. 4. Update the display adapter in Device Manager Microsoft’s supported next step for a non-desktop PC with a missing or ineffective brightness slider is to update the display driver. Search the taskbar for Device Manager and open it. Expand Display adapters . Right-click the listed display adapter. Select Update driver . Follow the prompts, restart the computer, and test brightness again. If Windows does not find a suitable driver, visit the computer manufacturer’s official support page and search by the exact laptop or all-in-one model. Prefer the manufacturer’s display or graphics driver for that model over an unidentified download site. Intel’s official brightness-slider troubleshooting guidance also lists graphics-driver updates, a clean manual graphics-driver installation, Windows updates, and system-file repair as escalation steps. 5. Escalate carefully if the problem began after a driver change If brightness stopped working immediately after a graphics-driver update, use the manufacturer’s support instructions for that exact model before experimenting with generic drivers. Keep a recovery path: record the current driver, use official sources, and create a restore point when available before making a major driver change.

Recommended Free Tools PC Running Hot? Fans Too Loud? Windows Errors? Fix Them Before They Spread Outdated Drivers Are Slowing You Down After Windows Update, Device Manager, and the manufacturer’s support page have failed to provide a suitable driver, a third-party utility such as Outbyte Driver Updater is an optional—not required—way to check for missing or outdated drivers. Outbyte says its software supports Windows 10 and searches for device-specific official drivers, but a driver utility is not guaranteed to fix a brightness problem and should not replace the official Microsoft or manufacturer path. How do you stop Windows 10 from changing brightness automatically? Open Settings > System > Display , find Change brightness automatically when lighting changes , and disable the option when it appears. The option is hardware-dependent, so its absence means that Windows may not expose automatic ambient-light control on that PC. If the screen changes brightness even after the automatic-lighting option is disabled, check whether the change happens during a battery or power transition. Battery Saver, switching between AC power and battery, closing and reopening the lid, restarting, and waking the laptop can all be relevant in certain HDR configurations. Can HDR cause brightness changes on a Windows 10 laptop? HDR can cause unexpected brightness behavior on some HDR-capable Windows 10 laptops after a power-state transition. The behavior is not universal, but Microsoft documents cases involving switching between battery and AC power, enabling Battery Saver, closing and reopening the lid, restarting, or waking the laptop. When the problem occurs, manually change the brightness after the transition and test whether the expected level returns. Then check for an updated display driver. Microsoft’s HDR settings documentation provides the relevant Windows guidance; do not treat an HDR-specific workaround as a universal explanation for every brightness problem. Why are the laptop brightness keys not working? Brightness keys generally depend on the laptop’s keyboard-control software, firmware, and graphics/display driver. First test the Display settings slider: if the slider works, the display itself is responding and the problem is more likely related to the keyboard shortcut or manufacturer utility. If the slider also fails, follow the display-driver troubleshooting sequence above. Use the laptop manufacturer’s official support page for the exact model when looking for keyboard utilities, hotkey software, firmware, or display drivers. Avoid installing a driver package that is not explicitly intended for the computer model. What Windows 10 support status means for brightness troubleshooting According to Microsoft’s Windows 10 Home and Pro lifecycle record , Windows 10 version 22H2 was the final mainstream Windows 10 release. According to Microsoft Support , Windows 10 Home and Pro support ended on October 14, 2025. Free tools Windows power users keep installed One-click scans. No signup required. This support status does not change the steps for moving the brightness slider. It does matter when a driver or system problem has no current Windows 10 fix: Microsoft recommends moving to Windows 11 where the PC is eligible, or considering the Consumer Extended Security Updates program where applicable. Keep the operating-system decision separate from the immediate brightness adjustment. Brightness troubleshooting checklist For a built-in screen, open Settings > System > Display and move Change brightness . On Windows 10 version 1903 or later, open Action Center from the taskbar notification icon and use Brightness . For an external monitor, use the monitor’s own physical buttons or on-screen display menu. If brightness changes automatically, disable Change brightness automatically when lighting changes when available. Install Windows updates, then restart. In Device Manager, open Display adapters , right-click the adapter, and select Update driver . If Windows cannot find a driver, use the exact computer manufacturer’s official support page. For HDR-capable laptops, test brightness after battery, AC-power, lid, restart, and wake transitions. Frequently Asked Questions How do I change brightness on an external monitor in Windows 10? Use the monitor’s physical buttons or its on-screen display menu. Windows 10 may not provide a software brightness slider for an external monitor. How do I stop Windows 10 from changing brightness automatically? Open Settings > System > Display and disable Change brightness automatically when lighting changes if that option is available. The setting is hardware-dependent and may not appear on every PC. Why is the brightness slider missing or not working on Windows 10? Confirm that the display is built in, install Windows updates, then open Device Manager > Display adapters, right-click the display adapter, and select Update driver. If Windows cannot find a driver, use the computer manufacturer’s official support page. Quick wins for a faster PC: The Bottom Line For a Windows 10 laptop’s built-in screen, use Settings > System > Display and move the brightness slider, or use Action Center on version 1903 and later. A missing slider usually points to an external monitor; a nonworking slider usually calls for Windows and display-driver updates. 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