Root/Documentation/video-output.txt

Source at commit b05a5adf03613de371c77c3235f7d970d7cd0c71 created 13 years 1 month ago.
By Lars-Peter Clausen, NAND: Optimize reading the eec data for the JZ4740 (evil hack)
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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:
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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
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