Documentation/admin-guide/video-output.rst

   1 Video Output Switcher Control
   2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   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