Apple introduced a feature in MacOS Big Sur v11.4 and has carried it through to the current version 12.4 of Monterey. The OS checks the LCD part/serial number(not sure what Kernel extension does this) against those hashed in the AppleBacklight.kext and AppleBacklightExpert.kext if they do not match then certain features of the display will be disabled (and no these kernel extensions can NOT be modified as Apple locked down the System/Library/Extensions folder. you can read them but can not change/delete them). [br]
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I have replaced the Screen on a 13" 2017 MBP with Touchbar, and the Brightness controls do not work at all and are missing from the Display Prefs Pane under Big Sur (v11.4+) and Monterey. However they are present and everything works fine in Mojave and Catalina.[br]
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I have replaced the Screen on a 13" 2017 MBP with Touchbar, with an OEM (plastic aftermarket shell and nameplate) and the Brightness controls do not work at all and are missing from the Display Prefs Pane under Big Sur (v11.4+) and Monterey. However they are present and everything works fine in Mojave and Catalina.[br]
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So if you have swapped over your display and find some features like Brightness controls are missing Try loading MacOS Catalina or Mojave, that may solve the issue.
Apple introduced a feature in MacOS Big Sur v11.4 and has carried it through to the current version 12.4 of Monterey. The OS checks the LCD part/serial number(not sure what Kernel extension does this) against those hashed in the AppleBacklight.kext and AppleBacklightExpert.kext if they do not match then certain features of the display will be disabled (and no these kernel extensions can NOT be modified as Apple locked down the System/Library/Extensions folder. you can read them but can not change/delete them). [br]
[br]
I have replaced the Screen on a 13" 2017 MBP with Touchbar, and the Brightness controls do not work at all and are missing from the Display Prefs Pane under Big Sur (v11.4+) and Monterey. However they are present and everything works fine in Mojave and Catalina.[br]
[br]
So if you have swapped over your display and find some features like Brightness controls are missing Try loading MacOS Catalina or Mojave, that may solve the issue.