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Latitude 7280: Problem with backlight control


Dell7280pl

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You just need to look them up in the various 7280 threads that exist on the forum. No-one published a specific guide here for this model unfortunately.

Eg:

 

What did you initially follow to install macOS on your laptop? @Lorys89 has a guide with all-inclusive SSDT here and brightness control is stated to be fully working. Maybe there's something not correctly set in your BIOS though I doubt it.

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You're probably mistaken re: DSDT and ACPI tables in general...

 

There's absolutely nothing to do with the ACPI tables you extracted. They're an integral part of your computer's BIOS so they load at power-on/boot time. As such, placing unmodified tables is the ACPI folder of your bootloader's EFI folder is of no use at all. It'd be as useful as applying a Dell sticker on top of the Dell logo already present on your laptop if you get my meaning. Only patched tables are of use and are to be placed in the EFI/ACPI folder.

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