如何禁用戴尔显示器跨应用自动调节亮度（疑涉Dell Display Manager）

Got it, let's tackle this auto-brightness annoyance when switching apps—since you suspect Dell Display Manager (DDM), that's our first stop. Here's how to shut that behavior down step by step:

• Open Dell Display Manager (search for it in the Windows Start menu, or find its icon in the system tray near your clock)
• Head to the Display Settings tab (some versions label this Brightness/Contrast instead)
• Look for options like Dynamic Brightness, Auto Brightness, or Intelligent Brightness—these are the features that adjust brightness based on app content or ambient light
• Toggle the switch to Off or uncheck the corresponding box. If you see a dropdown, select Disabled instead of Auto
• Make sure to click Apply or Save to lock in your changes

Sometimes DDM is just mirroring your monitor's own auto-brightness feature, so let's verify that too:

• Press the physical menu button on your Dell monitor (usually located at the bottom edge or side bezel)
• Use the monitor's arrow buttons to navigate to the Brightness/Contrast or Display Settings menu
• Look for options like Auto Brightness Control, Ambient Light Sensor, or Dynamic Contrast
• Disable this feature, then exit the monitor menu

Windows has its own auto-brightness tools that might be conflicting, so let's eliminate that possibility:

• Open Settings (Win + I) > System > Display
• Under the Brightness & color section, uncheck the box for Change brightness automatically when lighting changes
• If you're using a laptop (even with an external monitor), check power settings too: go to System > Power & sleep > Additional power settings > Select your active power plan > Change plan settings > Change advanced power settings > Expand Display > Enable adaptive brightness and set both On battery and Plugged in to Off

Quick Troubleshooting Tip #

If the issue persists after all these steps, try closing DDM completely (right-click its system tray icon and select Exit) and test app switching again. If the brightness stops changing, you might need to update DDM to the latest version or reinstall it to fix any corrupted settings.

内容的提问来源于stack exchange，提问作者Michael S.