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diff --git a/Documentation/ABI/stable/sysfs-class-backlight b/Documentation/ABI/stable/sysfs-class-backlight
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+What:           /sys/class/backlight/<backlight>/bl_power
+Date:           April 2005
+KernelVersion:  2.6.12
+Contact:        Richard Purdie <rpurdie@rpsys.net>
+Description:
+                Control BACKLIGHT power, values are FB_BLANK_* from fb.h
+                 - FB_BLANK_UNBLANK (0)   : power on.
+                 - FB_BLANK_POWERDOWN (4) : power off
+Users:          HAL
+
+What:           /sys/class/backlight/<backlight>/brightness
+Date:           April 2005
+KernelVersion:  2.6.12
+Contact:        Richard Purdie <rpurdie@rpsys.net>
+Description:
+                Control the brightness for this <backlight>. Values
+                are between 0 and max_brightness. This file will also
+                show the brightness level stored in the driver, which
+                may not be the actual brightness (see actual_brightness).
+Users:          HAL
+
+What:           /sys/class/backlight/<backlight>/actual_brightness
+Date:           March 2006
+KernelVersion:  2.6.17
+Contact:        Richard Purdie <rpurdie@rpsys.net>
+Description:
+                Show the actual brightness by querying the hardware.
+Users:          HAL
+
+What:           /sys/class/backlight/<backlight>/max_brightness
+Date:           April 2005
+KernelVersion:  2.6.12
+Contact:        Richard Purdie <rpurdie@rpsys.net>
+Description:
+                Maximum brightness for <backlight>.
+Users:          HAL