diff options
Diffstat (limited to 'Documentation/acpi')
-rw-r--r-- | Documentation/acpi/video_extension.txt | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/acpi/video_extension.txt b/Documentation/acpi/video_extension.txt new file mode 100644 index 000000000000..b2f9b1598ac2 --- /dev/null +++ b/Documentation/acpi/video_extension.txt | |||
@@ -0,0 +1,37 @@ | |||
1 | ACPI video extensions | ||
2 | ~~~~~~~~~~~~~~~~~~~~~ | ||
3 | |||
4 | This driver implement the ACPI Extensions For Display Adapters for | ||
5 | integrated graphics devices on motherboard, as specified in ACPI 2.0 | ||
6 | Specification, Appendix B, allowing to perform some basic control like | ||
7 | defining the video POST device, retrieving EDID information or to | ||
8 | setup a video output, etc. Note that this is an ref. implementation | ||
9 | only. It may or may not work for your integrated video device. | ||
10 | |||
11 | Interfaces exposed to userland through /proc/acpi/video: | ||
12 | |||
13 | VGA/info : display the supported video bus device capability like Video ROM, CRT/LCD/TV. | ||
14 | VGA/ROM : Used to get a copy of the display devices' ROM data (up to 4k). | ||
15 | VGA/POST_info : Used to determine what options are implemented. | ||
16 | VGA/POST : Used to get/set POST device. | ||
17 | VGA/DOS : Used to get/set ownership of output switching: | ||
18 | Please refer ACPI spec B.4.1 _DOS | ||
19 | VGA/CRT : CRT output | ||
20 | VGA/LCD : LCD output | ||
21 | VGA/TVO : TV output | ||
22 | VGA/*/brightness : Used to get/set brightness of output device | ||
23 | |||
24 | Notify event through /proc/acpi/event: | ||
25 | |||
26 | #define ACPI_VIDEO_NOTIFY_SWITCH 0x80 | ||
27 | #define ACPI_VIDEO_NOTIFY_PROBE 0x81 | ||
28 | #define ACPI_VIDEO_NOTIFY_CYCLE 0x82 | ||
29 | #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83 | ||
30 | #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84 | ||
31 | |||
32 | #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x82 | ||
33 | #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x83 | ||
34 | #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x84 | ||
35 | #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x85 | ||
36 | #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x86 | ||
37 | |||