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The brightness slider in the Windows 11 settings on a Dell AIO desktop does not work. The slider is sitting at zero as default but the screen is bright enough to see the displayed image. The slider can be moved, but it reverts back to zero. The slider is moved, but it does not affect the brightness on-screen. The brightness slider does not work after updating the operating system to version Win11 26100.2314 (24H2). Affected Platforms: Dell 24 All-in-One EC24250 Dell 27 All-in-One EC27250 Dell Pro 24 All-in-One Plus QB24250 Dell Pro 24 All-in-One QC24250 Inspiron 24 5410 All-in-One Inspiron 24 5411 All-in-One Inspiron 24 5415 All-in-One Inspiron 24 5420 All-in-One Inspiron 24 5421 All-in-One Inspiron 27 7710 All-in-One Inspiron 27 7720 All-in-One Inspiron 5401 AIO OptiPlex 5400 All-In-One OptiPlex 7400 All-In-One OptiPlex 7480 All-In-One OptiPlex 7490 All-In-One OptiPlex All-in-One 7410 OptiPlex All-in-One 7420 OptiPlex All-in-One Plus 7410 OptiPlex All-in-One Plus 7420
Microsoft acknowledges an issue with the update Win11 26100.2314 (24H2).
Workaround: Do not to use the slider in the display settings window if the update is not installed. Use the brightness slider available from the system icon tray instead. Click the status icon in the bottom right corner of the taskbar to open and close a small settings window as per the following example. Microsoft Resolution: Note: Before starting, perform the following: Back up all personal data. For more information, refer to: Back Up and Recovery Microsoft released the following update for installation, but it has not resolved this issue for every product: December 01, 2025: KB5070311 (OS Builds 26200.7309 and 26100.7309) Preview Update the Dell On-Screen Display Application to the latest version available for the desktop. To download and install the Dell-On-Screen-Display-Application_WIN64.exe file, refer to the: Driver Update Guide Microsoft has now released the following updates: Update using the 2026 1D fix: January 29, 2026: KB5074105 (OS Builds 26200.7705 and 26100.7705) Preview Then update from the 2026 2D fix: February 24, 2026: KB5077241 (OS Builds 26200.7922 and 26100.7922) Preview Reboot the desktop and confirm that the issue is resolved.
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