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ACPISURFACE(4) Device Drivers Manual ACPISURFACE(4)

acpisurface
Microsoft Surface Book ACPI support

acpisurface* at acpi?

The acpisurface driver provides ACPI support for Microsoft Surface Book laptops. It responds to various button presses such as volume up/down and power buttons, all of which are located on the top of the tablet/detachable display. It does not provide support for the hotkeys in the keyboard/base unit.
Volume up/down button presses are routed to the master system mixer via the wscons(4) subsystem. Power button presses result in a soft power off request being queued by the acpi(4) subsystem.

acpi(4), audio(4), wscons(4)

The acpisurface driver first appeared in OpenBSD 6.4.
July 1, 2018 OpenBSD-current