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Based on kernel version 3.15.4. Page generated on 2014-07-07 09:05 EST.

1	
2			Video Output Switcher Control
3			~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4			2006 luming.yu@intel.com
5	
6	The output sysfs class driver provides an abstract video output layer that
7	can be used to hook platform specific methods to enable/disable video output
8	device through common sysfs interface. For example, on my IBM ThinkPad T42
9	laptop, The ACPI video driver registered its output devices and read/write
10	method for 'state' with output sysfs class. The user interface under sysfs is:
11	
12	linux:/sys/class/video_output # tree .
13	.
14	|-- CRT0
15	|   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
16	|   |-- state
17	|   |-- subsystem -> ../../../class/video_output
18	|   `-- uevent
19	|-- DVI0
20	|   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
21	|   |-- state
22	|   |-- subsystem -> ../../../class/video_output
23	|   `-- uevent
24	|-- LCD0
25	|   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
26	|   |-- state
27	|   |-- subsystem -> ../../../class/video_output
28	|   `-- uevent
29	`-- TV0
30	   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
31	   |-- state
32	   |-- subsystem -> ../../../class/video_output
33	   `-- uevent
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