Forum Discussion
Cannot Adjust External Monitor Brightness in Windows 11 Without Third-Party Software
1. Check monitor settings: Adjust the brightness using the physical buttons or menus on the monitor.
Make sure the monitor supports adjusting the brightness via software (usually requires support for the DDC/CI protocol).
2. Update the graphics card driver: Open the Device Manager.
Expand “Display Adapters”, right-click on the graphics card and select “Update Driver”.
Select “Automatically search for updated driver software.
3. Check Windows Settings: Open Settings > System > Display.
Check if there is a brightness adjustment option. If not, try using a shortcut key (e.g. Fn + Brightness key).
4. Use third-party software: Download and install software that supports external monitor brightness adjustment (ClickMonitorDDC, Twinkle Tray, etc.). Adjust the brightness of the external monitor through the software.
5. Contact Microsoft Support: If none of the above methods work, it is recommended to contact Microsoft Support team with detailed error messages and screenshots for further assistance.
You clearly didn't read name of ticket.
"Cannot Adjust External Monitor Brightness in Windows 11 Without Third-Party Software".
The question address lack of support DDC/CI in Windows 11.
This slider works only for notebook internal monitor, but not for external monitors. And it cannot be extended by any 3rd party sw.