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Linux/Documentation/video-output.txt

  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
 34 

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