acpivga(4) [netbsd man page]
ACPIVGA(4) BSD Kernel Interfaces Manual ACPIVGA(4) NAME
acpivga -- ACPI Display Adapter and Output Devices SYNOPSIS
acpivga* at acpi? acpiout* at acpivga? DESCRIPTION
The acpivga driver provides generic support for brightness control and output switching, through ACPI video extensions. The ACPI specifica- tion requires that systems containing a built-in display adapter implement these extensions in their ACPI BIOS. The driver handles brightness hotkeys and display switch hotkeys. In addition, the following sysctl(8) read/write variables are provided (when hardware support is available): hw.acpi.acpivga0.bios_switch BIOS output switching policy. This boolean variable controls the behavior of the BIOS when a display switch hotkey is pressed. 1 the BIOS should automatically switch outputs, with no interaction from acpivga. 0 the BIOS should only notify acpivga of the desired output state changes. hw.acpi.acpiout0.brightness Brightness level. This integer variable typically ranges from 0 to 100, but any integer value is accepted (the driver uses the clos- est brightness level supported by the device). Please note, however, that future versions of acpivga may remove these sysctl(8) variables without prior notice. SEE ALSO
acpi(4), vga(4), sysctl(8) Microsoft Corporation, Mobile System Displays and Windows, Version 1.2c, http://www.microsoft.com/whdc/archive/mobiledisplay.mspx, December 4, 2001. HISTORY
The acpivga driver appeared in NetBSD 6.0. AUTHORS
Gregoire Sutre <gsutre@NetBSD.org> CAVEATS
The acpivga driver only supports PCI/PCI-X/PCI-E display adapters. Many ACPI BIOSes implement only part of the ACPI video extensions. In particular, display output switching via these extensions often does not work. For this reason, acpivga enables hw.acpi.acpivga0.bios_switch by default. If the display switch hotkey does not work with this default setting, try setting hw.acpi.acpivga0.bios_switch to 0. Brightness level should be controlled via wsconsctl(8) instead of sysctl(8). BSD
October 28, 2010 BSD
Check Out this Related Man Page
ACPI_PANASONIC(4) BSD Kernel Interfaces Manual ACPI_PANASONIC(4) NAME
acpi_panasonic -- ACPI hotkey driver for Panasonic laptops SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file: device acpi_panasonic Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): acpi_panasonic_load="YES" DESCRIPTION
The acpi_panasonic driver enables such hotkey facilities of various Panasonic laptops as changing LCD brightness, controlling mixer volumes, entering sleep or suspended state and so on. On the following models it is reported to work: Let's note (or Toughbook, outside Japan) CF- R1N, CF-R2A and CF-R3. It may also work on other models as well. The driver consists of three functionalities. The first is to detect hotkey events and take corresponding actions, which include changing LCD luminance and speaker mute state. The second role is to notify occurrences of the event by way of devctl(4) and eventually to devd(8). The third and last is to provide a way to adjust LCD brightness and sound mute state via sysctl(8). Hotkeys There are 9 hotkeys available on the supported hardware: Fn+F1 Make LCD backlight darker. Fn+F2 Make LCD backlight brighter. Fn+F3 Switch video output between LCD and CRT. Not supported by the acpi_panasonic driver. Fn+F4 Toggle muting the speaker. Fn+F5 Turn the mixer volume down. Fn+F6 Turn the mixer volume up. Fn+F7 Enter suspend-to-RAM state. Fn+F9 Show battery status. Fn+F10 Enter suspend-to-disk state. Actions are automatically taken within the driver for Fn+F1, Fn+F2 and Fn+F4. For the other events such as mixer control and showing battery status, devd(8) should take the role as described below. devd(8) Events When notified to devd(8), the hotkey event provides the following information: system "ACPI" subsystem "Panasonic" type The source of the event in ACPI namespace. The value depends on the model but typically "\_SB_.HKEY". notify Event code (see below). Event codes to be generated are assigned as follows: 0x81-0x86, 0x89 Fn+F<n> pressed. 0x81 corresponds to Fn+F1, 0x82 corresponds to Fn+F2, and so on. 0x01-0x07, 0x09, 0x1a Fn+F<n> released. 0x01 corresponds to Fn+F1, 0x02 corresponds to Fn+F2, and so on. SYSCTL VARIABLES
The following MIBs are available: hw.acpi.panasonic.lcd_brightness_max The maximum level of brightness. The value is read only and automatically set according to hardware model. hw.acpi.panasonic.lcd_brightness_min The minimum level of brightness. The value is read only and automatically set according to hardware model. hw.acpi.panasonic.lcd_brightness Current brightness level of the LCD (read-write). The value ranges from hw.acpi.panasonic.lcd_brightness_min to hw.acpi.panasonic.lcd_brightness_max. hw.acpi.panasonic.sound_mute A read-write boolean flag to control whether to mute the speaker. The value 1 means to mute and 0 not. SEE ALSO
acpi(4), devd.conf(5), devd(8), sysctl(8) HISTORY
The acpi_panasonic driver first appeared in FreeBSD 5.3. AUTHORS
The acpi_panasonic driver and this manual page were written by OGAWA Takaya <t-ogawa@triaez.kaisei.org> and TAKAHASHI Yoshihiro <nyan@FreeBSD.org>. BSD
February 25, 2012 BSD