swh:1:snp:32555a3fd8878f019c2ebd6c964bc1edcaeff337
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Tip revision: b2cd1df66037e7c4697c7e40496bf7e4a5e16a2d authored by Linus Torvalds on 07 January 2018, 22:22:41 UTC
Linux 4.15-rc7
Tip revision: b2cd1df
video-output.txt

		Video Output Switcher Control
		~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
		2006 luming.yu@intel.com

The output sysfs class driver provides an abstract video output layer that
can be used to hook platform specific methods to enable/disable video output
device through common sysfs interface. For example, on my IBM ThinkPad T42
laptop, The ACPI video driver registered its output devices and read/write
method for 'state' with output sysfs class. The user interface under sysfs is:

linux:/sys/class/video_output # tree .
.
|-- CRT0
|   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
|   |-- state
|   |-- subsystem -> ../../../class/video_output
|   `-- uevent
|-- DVI0
|   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
|   |-- state
|   |-- subsystem -> ../../../class/video_output
|   `-- uevent
|-- LCD0
|   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
|   |-- state
|   |-- subsystem -> ../../../class/video_output
|   `-- uevent
`-- TV0
   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
   |-- state
   |-- subsystem -> ../../../class/video_output
   `-- uevent

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