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- ACPI video extensions
- ~~~~~~~~~~~~~~~~~~~~~
- 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/TVO : 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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