| 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 | |