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sysfs-class-backlight

sysfs-class-backlight 1.9 KB
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  1. What:		/sys/class/backlight/<backlight>/bl_power
    2. 

  2. Date:		April 2005
    3. 

  3. KernelVersion:	2.6.12
    4. 

  4. Contact:	Richard Purdie <rpurdie@rpsys.net>
    5. 

  5. Description:
    6. 

  6. 		Control BACKLIGHT power, values are FB_BLANK_* from fb.h
    7. 

  7. 		 - FB_BLANK_UNBLANK (0)   : power on.
    8. 

  8. 		 - FB_BLANK_POWERDOWN (4) : power off
    9. 

  9. Users:		HAL
    10. 

  10. 

  11. What:		/sys/class/backlight/<backlight>/brightness
    12. 

  12. Date:		April 2005
    13. 

  13. KernelVersion:	2.6.12
    14. 

  14. Contact:	Richard Purdie <rpurdie@rpsys.net>
    15. 

  15. Description:
    16. 

  16. 		Control the brightness for this <backlight>. Values
    17. 

  17. 		are between 0 and max_brightness. This file will also
    18. 

  18. 		show the brightness level stored in the driver, which
    19. 

  19. 		may not be the actual brightness (see actual_brightness).
    20. 

  20. Users:		HAL
    21. 

  21. 

  22. What:		/sys/class/backlight/<backlight>/actual_brightness
    23. 

  23. Date:		March 2006
    24. 

  24. KernelVersion:	2.6.17
    25. 

  25. Contact:	Richard Purdie <rpurdie@rpsys.net>
    26. 

  26. Description:
    27. 

  27. 		Show the actual brightness by querying the hardware.
    28. 

  28. Users:		HAL
    29. 

  29. 

  30. What:		/sys/class/backlight/<backlight>/max_brightness
    31. 

  31. Date:		April 2005
    32. 

  32. KernelVersion:	2.6.12
    33. 

  33. Contact:	Richard Purdie <rpurdie@rpsys.net>
    34. 

  34. Description:
    35. 

  35. 		Maximum brightness for <backlight>.
    36. 

  36. Users:		HAL
    37. 

  37. 

  38. What:		/sys/class/backlight/<backlight>/type
    39. 

  39. Date:		September 2010
    40. 

  40. KernelVersion:	2.6.37
    41. 

  41. Contact:	Matthew Garrett <mjg@redhat.com>
    42. 

  42. Description:
    43. 

  43. 		The type of interface controlled by <backlight>.
    44. 

  44. 		"firmware": The driver uses a standard firmware interface
    45. 

  45. 		"platform": The driver uses a platform-specific interface
    46. 

  46. 		"raw": The driver controls hardware registers directly
    47. 

  47. 

  48. 		In the general case, when multiple backlight
    49. 

  49. 		interfaces are available for a single device, firmware
    50. 

  50. 		control should be preferred to platform control should
    51. 

  51. 		be preferred to raw control. Using a firmware
    52. 

  52. 		interface reduces the probability of confusion with
    53. 

  53. 		the hardware and the OS independently updating the
    54. 

  54. 		backlight state. Platform interfaces are mostly a
    55. 

  55. 		holdover from pre-standardisation of firmware
    56. 

  56. 		interfaces.
    57. 

  57.