| Pavel Machek | 5ce47e5 | 2005-06-25 14:55:10 -0700 | [diff] [blame] | 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. |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | |
| 11 | Interfaces exposed to userland through /proc/acpi/video: |
| 12 | |
| Pavel Machek | 5ce47e5 | 2005-06-25 14:55:10 -0700 | [diff] [blame] | 13 | VGA/info : display the supported video bus device capability like Video ROM, CRT/LCD/TV. |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
| Pavel Machek | 5ce47e5 | 2005-06-25 14:55:10 -0700 | [diff] [blame] | 21 | VGA/TVO : TV output |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |