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LG UltraFine External Display with MacBook Big Sur 11.6 Cannot Adjust Screen Brightness

Just upgraded to Big Sur 11.6. Before this I could adjust the brightness separately on the MacBook and external Screens. Now the Brightness Scroll bar on the Display control panel has no effect and there is no check box to turn off "Automatically Adjust Brightness" but when I open the System Report on About this Mac, it says it is turned on:

LG UltraFine:


  Resolution: 4096 x 2304


  UI Looks like: 2048 x 1152 @ 60.00Hz


  Framebuffer Depth: 30-Bit Colour (ARGB2101010)


  Display Serial Number: 803NTFA55515


  Mirror: Off


  Online: Yes


  Rotation: Supported


  Automatically Adjust Brightness: Yes


  Connection Type: Thunderbolt/DisplayPort



How do I adjust the brightness on the external monitor because the default setting is too bright?


MacBook Air 13″, macOS 11.6

Posted on Sep 26, 2021 4:08 AM

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Question marked as Top-ranking reply

Posted on Sep 26, 2021 5:59 AM

Some standard things to try include:


Reset NVRAM or PRAM on your Mac - Apple Support


How to reset the SMC of your Mac - Apple Support

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LG UltraFine External Display with MacBook Big Sur 11.6 Cannot Adjust Screen Brightness

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