Based on kernel version 3.10. Page generated on 2013-07-08 20:17 EST.
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