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ABL(4) Device Drivers Manual ABL(4)

ablApple backlight support

abl* at acpi?

The abl driver enables access to the backlight found in Intel based Apple iMac computers. It provides brightness control using the wsconsctl(8) variable display.brightness.

acpi(4), intro(4), wsconsctl(8)

The abl driver first appeared in OpenBSD 6.8.

The abl driver was written by Marcus Glocker <>.

October 25, 2020 OpenBSD-7.1