1Video Output Switcher Control 2~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3 42006 luming.yu@intel.com 5 6The output sysfs class driver provides an abstract video output layer that 7can be used to hook platform specific methods to enable/disable video output 8device through common sysfs interface. For example, on my IBM ThinkPad T42 9laptop, The ACPI video driver registered its output devices and read/write 10method 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 34 35