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Hello,
My Hardware: Dell precision 7550.
I got issue with backlight control, it work fine if i turn the HDR on. When the HDR turned off, I can drag the brightness slider but the bright on screen does not change.
I have tried all ig-platform-id for CFL/CML but the same result.
Please advise.

image.thumb.png.aafc81cd57a1a4d0b61e2381155667fd.png

You can see my EFI at: https://github.com/acidanthera/bugtracker/files/11624533/EFI.zip

IOReg20230601.zip

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