Merge branch 'work.sane_pwd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux-2.6-block.git] / Documentation / video-output.txt
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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