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