1 What: /sys/class/backlight/<backligh 1 What: /sys/class/backlight/<backlight>/bl_power
2 Date: April 2005 2 Date: April 2005
3 KernelVersion: 2.6.12 3 KernelVersion: 2.6.12
4 Contact: Richard Purdie <rpurdie@rpsys.n 4 Contact: Richard Purdie <rpurdie@rpsys.net>
5 Description: 5 Description:
6 Control BACKLIGHT power, value !! 6 Control BACKLIGHT power, values are FB_BLANK_* from fb.h
7 FB_BLANK_* from fb.h !! 7 - FB_BLANK_UNBLANK (0) : power on.
8 !! 8 - FB_BLANK_POWERDOWN (4) : power off
9 - 0 (FB_BLANK_UNBLANK) : po <<
10 - 4 (FB_BLANK_POWERDOWN) : po <<
11 Users: HAL 9 Users: HAL
12 10
13 What: /sys/class/backlight/<backligh 11 What: /sys/class/backlight/<backlight>/brightness
14 Date: April 2005 12 Date: April 2005
15 KernelVersion: 2.6.12 13 KernelVersion: 2.6.12
16 Contact: Richard Purdie <rpurdie@rpsys.n 14 Contact: Richard Purdie <rpurdie@rpsys.net>
17 Description: 15 Description:
18 Control the brightness for thi 16 Control the brightness for this <backlight>. Values
19 are between 0 and max_brightne 17 are between 0 and max_brightness. This file will also
20 show the brightness level stor 18 show the brightness level stored in the driver, which
21 may not be the actual brightne 19 may not be the actual brightness (see actual_brightness).
22 Users: HAL 20 Users: HAL
23 21
24 What: /sys/class/backlight/<backligh 22 What: /sys/class/backlight/<backlight>/actual_brightness
25 Date: March 2006 23 Date: March 2006
26 KernelVersion: 2.6.17 24 KernelVersion: 2.6.17
27 Contact: Richard Purdie <rpurdie@rpsys.n 25 Contact: Richard Purdie <rpurdie@rpsys.net>
28 Description: 26 Description:
29 Show the actual brightness by 27 Show the actual brightness by querying the hardware.
30 Users: HAL 28 Users: HAL
31 29
32 What: /sys/class/backlight/<backligh 30 What: /sys/class/backlight/<backlight>/max_brightness
33 Date: April 2005 31 Date: April 2005
34 KernelVersion: 2.6.12 32 KernelVersion: 2.6.12
35 Contact: Richard Purdie <rpurdie@rpsys.n 33 Contact: Richard Purdie <rpurdie@rpsys.net>
36 Description: 34 Description:
37 Maximum brightness for <backli 35 Maximum brightness for <backlight>.
38 Users: HAL 36 Users: HAL
39 <<
40 What: /sys/class/backlight/<backligh <<
41 Date: September 2010 <<
42 KernelVersion: 2.6.37 <<
43 Contact: Matthew Garrett <mjg@redhat.com <<
44 Description: <<
45 The type of interface controll <<
46 "firmware": The driver uses a <<
47 "platform": The driver uses a <<
48 "raw": The driver controls har <<
49 <<
50 In the general case, when mult <<
51 interfaces are available for a <<
52 control should be preferred to <<
53 be preferred to raw control. U <<
54 interface reduces the probabil <<
55 the hardware and the OS indepe <<
56 backlight state. Platform inte <<
57 holdover from pre-standardisat <<
58 interfaces. <<
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