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-rw-r--r--Documentation/power/video_extension.txt19
1 files changed, 11 insertions, 8 deletions
diff --git a/Documentation/power/video_extension.txt b/Documentation/power/video_extension.txt
index 8e33d7c82c49..b2f9b1598ac2 100644
--- a/Documentation/power/video_extension.txt
+++ b/Documentation/power/video_extension.txt
@@ -1,13 +1,16 @@
1This driver implement the ACPI Extensions For Display Adapters 1ACPI video extensions
2for integrated graphics devices on motherboard, as specified in 2~~~~~~~~~~~~~~~~~~~~~
3ACPI 2.0 Specification, Appendix B, allowing to perform some basic 3
4control like defining the video POST device, retrieving EDID information 4This driver implement the ACPI Extensions For Display Adapters for
5or to setup a video output, etc. Note that this is an ref. implementation only. 5integrated graphics devices on motherboard, as specified in ACPI 2.0
6It may or may not work for your integrated video device. 6Specification, Appendix B, allowing to perform some basic control like
7defining the video POST device, retrieving EDID information or to
8setup a video output, etc. Note that this is an ref. implementation
9only. It may or may not work for your integrated video device.
7 10
8Interfaces exposed to userland through /proc/acpi/video: 11Interfaces exposed to userland through /proc/acpi/video:
9 12
10VGA/info : display the supported video bus device capability like ,Video ROM, CRT/LCD/TV. 13VGA/info : display the supported video bus device capability like Video ROM, CRT/LCD/TV.
11VGA/ROM : Used to get a copy of the display devices' ROM data (up to 4k). 14VGA/ROM : Used to get a copy of the display devices' ROM data (up to 4k).
12VGA/POST_info : Used to determine what options are implemented. 15VGA/POST_info : Used to determine what options are implemented.
13VGA/POST : Used to get/set POST device. 16VGA/POST : Used to get/set POST device.
@@ -15,7 +18,7 @@ VGA/DOS : Used to get/set ownership of output switching:
15 Please refer ACPI spec B.4.1 _DOS 18 Please refer ACPI spec B.4.1 _DOS
16VGA/CRT : CRT output 19VGA/CRT : CRT output
17VGA/LCD : LCD output 20VGA/LCD : LCD output
18VGA/TV : TV output 21VGA/TVO : TV output
19VGA/*/brightness : Used to get/set brightness of output device 22VGA/*/brightness : Used to get/set brightness of output device
20 23
21Notify event through /proc/acpi/event: 24Notify event through /proc/acpi/event: