2 Video Output Switcher Control
3 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 2006 luming.yu@intel.com
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:
12 linux:/sys/class/video_output # tree .
15 | |-- device -> ../../../devices/pci0000:00/0000:00:01.0
17 | |-- subsystem -> ../../../class/video_output
20 | |-- device -> ../../../devices/pci0000:00/0000:00:01.0
22 | |-- subsystem -> ../../../class/video_output
25 | |-- device -> ../../../devices/pci0000:00/0000:00:01.0
27 | |-- subsystem -> ../../../class/video_output
30 |-- device -> ../../../devices/pci0000:00/0000:00:01.0
32 |-- subsystem -> ../../../class/video_output