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- This driver implement the ACPI Extensions For Display Adapters
- for integrated graphics devices on motherboard, as specified in
- ACPI 2.0 Specification, Appendix B, allowing to perform some basic
- control like defining the video POST device, retrieving EDID information
- or to setup a video output, etc. Note that this is an ref. implementation only.
- It may or may not work for your integrated video device.
- Interfaces exposed to userland through /proc/acpi/video:
- VGA/info : display the supported video bus device capability like ,Video ROM, CRT/LCD/TV.
- VGA/ROM : Used to get a copy of the display devices' ROM data (up to 4k).
- VGA/POST_info : Used to determine what options are implemented.
- VGA/POST : Used to get/set POST device.
- VGA/DOS : Used to get/set ownership of output switching:
- Please refer ACPI spec B.4.1 _DOS
- VGA/CRT : CRT output
- VGA/LCD : LCD output
- VGA/TV : TV output
- VGA/*/brightness : Used to get/set brightness of output device
- Notify event through /proc/acpi/event:
- #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
- #define ACPI_VIDEO_NOTIFY_PROBE 0x81
- #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
- #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
- #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
- #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x82
- #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x83
- #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x84
- #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x85
- #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x86
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