From 643a06a7f43e244d41d25383ce95e3e4554f21af Mon Sep 17 00:00:00 2001 From: Yu Luming Date: Tue, 19 Dec 2006 12:56:18 -0800 Subject: [PATCH] --- yaml --- r: 46478 b: refs/heads/master c: b03637b8863159a4518cb0a9ab90577460fe3417 h: refs/heads/master v: v3 --- [refs] | 2 +- trunk/Documentation/video-output.txt | 34 ++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+), 1 deletion(-) create mode 100644 trunk/Documentation/video-output.txt diff --git a/[refs] b/[refs] index a4254615e349..2ff5ea758c79 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: 2dec3ba8d872aa3ffbcdb8f6f8a2c0bcd44e9910 +refs/heads/master: b03637b8863159a4518cb0a9ab90577460fe3417 diff --git a/trunk/Documentation/video-output.txt b/trunk/Documentation/video-output.txt new file mode 100644 index 000000000000..e517011be4f9 --- /dev/null +++ b/trunk/Documentation/video-output.txt @@ -0,0 +1,34 @@ + + 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 +