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ACPI_VIDEO(4FREEBSD) - Linux man page online | Special files

ACPI Video Extensions driver.

Chapter
November 8, 2004
ACPI_VIDEO(4) BSD Kernel Interfaces Manual ACPI_VIDEO(4)

NAME

acpi_video — ACPI Video Extensions driver

SYNOPSIS

device acpi_video

DESCRIPTION

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.

SEE ALSO

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

HISTORY

The acpi_video driver first appeared in FreeBSD 5.3.

AUTHORS

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

BUGS

Some systems only perform output switching via SMM even though they export the proper infor‐ mation via ACPI. On such systems, the proper hotkeys or OEM driver (for example, acpi_toshiba(4)) must be used instead.
BSD November 8, 2004 BSD
This manual Reference Other manuals
acpi_video(4freebsd) referred by acpi(4freebsd) | acpi_asus(4freebsd) | acpi_asus_wmi(4freebsd) | acpi_toshiba(4freebsd) | dpms(4freebsd)
refer to acpi(4freebsd) | acpi_toshiba(4freebsd) | sysctl(8) | sysctl.conf(5)
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