diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/power/video_extension.txt |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'Documentation/power/video_extension.txt')
-rw-r--r-- | Documentation/power/video_extension.txt | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/Documentation/power/video_extension.txt b/Documentation/power/video_extension.txt new file mode 100644 index 000000000000..8e33d7c82c49 --- /dev/null +++ b/Documentation/power/video_extension.txt | |||
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1 | This driver implement the ACPI Extensions For Display Adapters | ||
2 | for integrated graphics devices on motherboard, as specified in | ||
3 | ACPI 2.0 Specification, Appendix B, allowing to perform some basic | ||
4 | control like defining the video POST device, retrieving EDID information | ||
5 | or to setup a video output, etc. Note that this is an ref. implementation only. | ||
6 | It may or may not work for your integrated video device. | ||
7 | |||
8 | Interfaces exposed to userland through /proc/acpi/video: | ||
9 | |||
10 | VGA/info : display the supported video bus device capability like ,Video ROM, CRT/LCD/TV. | ||
11 | VGA/ROM : Used to get a copy of the display devices' ROM data (up to 4k). | ||
12 | VGA/POST_info : Used to determine what options are implemented. | ||
13 | VGA/POST : Used to get/set POST device. | ||
14 | VGA/DOS : Used to get/set ownership of output switching: | ||
15 | Please refer ACPI spec B.4.1 _DOS | ||
16 | VGA/CRT : CRT output | ||
17 | VGA/LCD : LCD output | ||
18 | VGA/TV : TV output | ||
19 | VGA/*/brightness : Used to get/set brightness of output device | ||
20 | |||
21 | Notify event through /proc/acpi/event: | ||
22 | |||
23 | #define ACPI_VIDEO_NOTIFY_SWITCH 0x80 | ||
24 | #define ACPI_VIDEO_NOTIFY_PROBE 0x81 | ||
25 | #define ACPI_VIDEO_NOTIFY_CYCLE 0x82 | ||
26 | #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83 | ||
27 | #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84 | ||
28 | |||
29 | #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x82 | ||
30 | #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x83 | ||
31 | #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x84 | ||
32 | #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x85 | ||
33 | #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x86 | ||
34 | |||