acpi_video4
Acpi video extensions driver
Usage
device acpi_video
Overview
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.
Sysctl variables
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.
Compatibility
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.
Releases
52 releases since FreeBSD 5.3-RELEASE; the text changed 33 times.