Commit | Line | Data |
---|---|---|
5ce47e59 PM |
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. | |
1da177e4 LT |
10 | |
11 | Interfaces exposed to userland through /proc/acpi/video: | |
12 | ||
5ce47e59 | 13 | VGA/info : display the supported video bus device capability like Video ROM, CRT/LCD/TV. |
1da177e4 LT |
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 | |
5ce47e59 | 21 | VGA/TVO : TV output |
1da177e4 LT |
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 |