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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 | |
38 |
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