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 9.4 |