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NetBSD 6.1.5 - man page for acpivga (netbsd section 4)

ACPIVGA(4)			   BSD Kernel Interfaces Manual 		       ACPIVGA(4)

     acpivga -- ACPI Display Adapter and Output Devices

     acpivga* at acpi?
     acpiout* at acpivga?

     The acpivga driver provides generic support for brightness control and output switching,
     through ACPI video extensions.  The ACPI specification 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 follow-
     ing sysctl(8) read/write variables are provided (when hardware support is available):

	     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.

	     Brightness level.	This integer variable typically ranges from 0 to 100, but any
	     integer value is accepted (the driver uses the closest brightness level supported by
	     the device).

     Please note, however, that future versions of acpivga may remove these sysctl(8) variables
     without prior notice.

     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.

     The acpivga driver appeared in NetBSD 6.0.

     Gregoire Sutre <gsutre@NetBSD.org>

     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

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