| ACPIVGA(4) | Device Drivers Manual | ACPIVGA(4) | 
acpivga —
acpivga* at acpi?
acpiout* at acpivga?
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 following sysctl(8) read/write variables are provided (when hardware support is available):
acpivga.acpivga of the
          desired output state changes.Please note, however, that future versions of
    acpivga may remove these
    sysctl(8) variables without
    prior notice.
Microsoft Corporation, Mobile System Displays and Windows, Version 1.2c, http://www.microsoft.com/whdc/archive/mobiledisplay.mspx, December 4, 2001.
acpivga driver appeared in NetBSD
  6.0.
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).
| October 28, 2010 | NetBSD 10.1 |