1 2 Video Output Switcher Control 3 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4 2006 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 12linux:/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