AMD GPU: Toshiba, brightness and ATIF

Hello, I'm trying to figure out how to control the brightness of the screen of my laptop, a Toshiba L885-10W. The ACPI DSDT table contains the standard control methods, the setter (_BCM), however, only sets a value in the record returned by ATIF method and send out a notification: CreateByteField

AMD GPU: Toshiba, brightness and ATIF

Hello, I'm trying to figure out how to control the brightness of the screen of my laptop, a Toshiba L885-10W. The ACPI DSDT table contains the standard control methods, the setter (_BCM), however, only sets a value in the record returned by ATIF method and send out a notification: CreateByteField