mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-11-01 02:21:16 +00:00
5ce47e59c9
This fixes typos/formatting in video_extension.txt. Signed-off-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
37 lines
1.5 KiB
Text
37 lines
1.5 KiB
Text
ACPI video extensions
|
|
~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
This driver implement the ACPI Extensions For Display Adapters for
|
|
integrated graphics devices on motherboard, as specified in ACPI 2.0
|
|
Specification, Appendix B, allowing to perform some basic control like
|
|
defining the video POST device, retrieving EDID information or to
|
|
setup a video output, etc. Note that this is an ref. implementation
|
|
only. It may or may not work for your integrated video device.
|
|
|
|
Interfaces exposed to userland through /proc/acpi/video:
|
|
|
|
VGA/info : display the supported video bus device capability like Video ROM, CRT/LCD/TV.
|
|
VGA/ROM : Used to get a copy of the display devices' ROM data (up to 4k).
|
|
VGA/POST_info : Used to determine what options are implemented.
|
|
VGA/POST : Used to get/set POST device.
|
|
VGA/DOS : Used to get/set ownership of output switching:
|
|
Please refer ACPI spec B.4.1 _DOS
|
|
VGA/CRT : CRT output
|
|
VGA/LCD : LCD output
|
|
VGA/TVO : TV output
|
|
VGA/*/brightness : Used to get/set brightness of output device
|
|
|
|
Notify event through /proc/acpi/event:
|
|
|
|
#define ACPI_VIDEO_NOTIFY_SWITCH 0x80
|
|
#define ACPI_VIDEO_NOTIFY_PROBE 0x81
|
|
#define ACPI_VIDEO_NOTIFY_CYCLE 0x82
|
|
#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
|
|
#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
|
|
|
|
#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x82
|
|
#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x83
|
|
#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x84
|
|
#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x85
|
|
#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x86
|
|
|