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Man Pages
ACPI_VIDEO(4) FreeBSD Kernel Interfaces Manual ACPI_VIDEO(4)

acpi_video
ACPI Video Extensions driver

device acpi_video

This driver uses the ACPI Video Extensions to control display switching and backlight brightness. The availability of the sysctl(8) variables depends on the functions offered by the host's ACPI implementation.

The following sysctls are currently implemented, where ⟨device⟩ is crt, lcd, or tv:
hw.acpi.video.device.active
Current state of the output device.
hw.acpi.video.device.levels
List of supported brightness levels.
hw.acpi.video.device.brightness
Current brightness level of the device.
hw.acpi.video.device.fullpower
Preset brightness level to be used in full power mode.
hw.acpi.video.device.economy
Preset brightness level to be used in economy mode.

Defaults for these variables can be set in sysctl.conf(5), which is parsed at boot-time.

In order for acpi_video to attach correctly, acpi_video should be loaded after any of the DRM kernel modules. This can be achieved by setting the correct order in rc.conf(5) using the kld_list directive.

acpi(4), loader.conf(5), sysctl.conf(5), sysctl(8)

The acpi_video driver first appeared in FreeBSD 5.3.

The acpi_video driver was written by Taku YAMAMOTO <taku@cent.saitama-u.ac.jp>. This manual page was written by Mark Santcroos <marks@ripe.net>.

Some systems only perform output switching via SMM even though they export the proper information via ACPI. On such systems, the proper hotkeys or OEM driver (for example, acpi_toshiba(4)) must be used instead.
November 8, 2004 FreeBSD 13.1-RELEASE

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