https://bugzilla.kernel.org/show_bug.cgi?id=77091

--- Comment #6 from Zhang Rui <[email protected]> ---
First of all, you're using intel_backlight for backlight control, right?
Does ACPI backlight work for you?
Because every time you plug/unplug the AC, AML will try to restore the
backlight level to a default value, which will not be initialized if you do not
use ACPI backlight.

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