# How to Fix Windows 11's Missing External Monitor Brightness Slider > Learn how to control your external monitor brightness on Windows 11 using Monitorian, a free app that fixes Microsoft's missing multi-monitor slider. - Canonical URL: https://coreiten.com/en/article/how-to-fix-windows-11s-missing-external-monitor-brightness-slider - Language: en - Section: Windows - Author: Sami - Published: 2026-09-07T22:01:33+03:00 - Modified: 2026-09-07T22:01:33+03:00 - Publisher: CoreITen (https://coreiten.com) - Keywords: Monitorian, Windows 11 external monitor brightness, DDC/CI, Twinkle Tray, multi-monitor setup, adjust screen brightness ## Summary Windows 11 lacks a native brightness slider for external monitors, forcing users to rely on third-party utilities to control their displays. - Microsoft leaves external monitors out of the native brightness slider because Windows was designed specifically for internal laptop panels. - Monitorian is a free, open-source utility created by developer emoacht that adds dedicated brightness sliders for every connected display. - The app utilizes the Display Data Channel/Command Interface protocol, which most modern monitors already use to communicate with PCs. - Monitorian supports up to four monitors on the free tier and includes a "Move in unison" toggle for synchronized brightness adjustments. - Twinkle Tray serves as a popular alternative that mimics the native Windows Quick Settings panel with built-in volume and power controls. **Why it matters:** This highlights a persistent UI oversight in Windows 11 where basic multi-monitor management relies entirely on third-party developers. --- Plugging an external monitor into a Windows 11 setup immediately highlights a frustrating limitation: the native brightness slider only controls your primary display. While the slider remains visible in the system tray, it completely ignores any secondary screens, forcing users to reach for the physical buttons on their monitors. This is not a bug, but a deliberate design choice by Microsoft, as the operating system was built to control the backlight on internal laptop panels rather than external desktop displays. The irony is that the hardware capability already exists. Most modern monitors communicate with your PC using a protocol called Display Data Channel/Command Interface (DDC/CI). This is the exact same channel your monitor uses to report its specifications and capabilities to Windows. The underlying hardware support is fully functional, but Microsoft simply never wired up a front-end slider to utilize it. This gap leaves multi-monitor users without a basic quality-of-life feature. ### The Open-Source Solution: Monitorian To solve this exact problem, developer emoacht created Monitorian, a free, lightweight, and open-source utility that has been actively maintained since 2017. Currently on version 4.13, the app bypasses the need for physical monitor buttons by adding a dedicated slider for every connected display directly into your system tray. It seamlessly integrates into your workflow, offering a small fly-out window where you can manage your laptop panel and external monitors in one place. Monitorian goes beyond basic functionality by allowing users to break free from the default 0 to 100 range. You can set a custom adjustable range for both brightness and contrast per monitor, which is particularly useful if your display's lowest hardware setting is still too harsh in a dark room. For users running two, three, or up to four monitors on the free tier, the app includes a "Move in unison" toggle. This allows every screen to brighten or dim together with a single drag, though you can easily disable it when sunlight hits one specific monitor at a different angle. ### How to Set Up and Configure Monitorian Getting the app running takes only a few minutes. Follow these steps to integrate external brightness controls into your system: 1. **Download** the app from the [Monitorian Microsoft Store page](https://apps.microsoft.com/detail/9nw33j738bl0) or via the [GitHub documentation](https://github.com/emoacht/Monitorian). *This ensures you are getting the verified, latest version of the utility.* 2. **Install** and launch the tool on your PC. *This prompts the app to automatically scan for every DDC/CI capable display currently connected to your system.* 3. **Right-click** the new tray icon and check the "Start on sign-in" option. *This enables the utility to run automatically every time your PC boots up, ensuring the sliders are always available.* 4. **Toggle** the "Move in unison" setting if you want synchronized control. *This allows you to adjust the brightness of all connected screens simultaneously with one movement.* ### Troubleshooting and Alternatives If a display fails to appear in the Monitorian list, the issue rarely lies with the app itself. The most common culprits are monitors that have the DDC/CI toggle switched off in their physical on-screen menu, or older displays that lack DDC/CI support entirely. Additionally, certain docking stations or display adapters may fail to pass the DDC/CI signals through to the PC. To rule this out, try connecting the monitor directly to your PC's HDMI or DisplayPort. For users looking for a slightly different aesthetic, Twinkle Tray is a frequently recommended alternative. While Monitorian is praised for its minimal footprint and unobtrusive settings, Twinkle Tray offers a flyout menu that closely mimics the native Windows Quick Settings panel, complete with built-in volume and power controls. Both apps are free for basic brightness adjustments, though Monitorian offers a premium subscription that unlocks hotkeys, command-line control, and support for more than four monitors simultaneously. ### The Multi-Monitor Gap Microsoft Refuses to Close The necessity of apps like Monitorian highlights a persistent blind spot in Microsoft's approach to desktop user experience. By relying on the DDC/CI protocol - a standard that has existed for decades - Monitorian proves that controlling external monitor brightness via software requires minimal system overhead. Yet, Windows 11 continues to treat external displays as passive output devices rather than integrated components of the workspace. This reliance on third-party, open-source developers to patch basic UI omissions is a recurring theme for Windows. While Microsoft focuses heavily on integrating AI features and overhauling the Start menu, fundamental multi-monitor management remains stagnant. Until Microsoft decides to build a native DDC/CI front-end, utilities like Monitorian will remain essential installations for anyone looking to build a seamless, modern desktop environment. ## Sources - [makeuseof.com](https://www.makeuseof.com/this-free-app-adds-the-external-monitor-brightness-slider-that-windows-11-forgot/)