~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/Documentation/ABI/stable/sysfs-class-backlight

Version: ~ [ linux-6.12-rc7 ] ~ [ linux-6.11.7 ] ~ [ linux-6.10.14 ] ~ [ linux-6.9.12 ] ~ [ linux-6.8.12 ] ~ [ linux-6.7.12 ] ~ [ linux-6.6.60 ] ~ [ linux-6.5.13 ] ~ [ linux-6.4.16 ] ~ [ linux-6.3.13 ] ~ [ linux-6.2.16 ] ~ [ linux-6.1.116 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.171 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.229 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.285 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.323 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.336 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.4.302 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.12 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

Diff markup

Differences between /Documentation/ABI/stable/sysfs-class-backlight (Architecture ppc) and /Documentation/ABI/stable/sysfs-class-backlight (Architecture sparc)


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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

sflogo.php