1 files changed, 14 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 5b6e58492229..b69cfdc12112 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -987,6 +987,20 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
         i8k.restricted  [HW] Allow controlling fans only if SYS_ADMIN
                         capability is set.
 
+        i915.invert_brightness=
+                        [DRM] Invert the sense of the variable that is used to
+                        set the brightness of the panel backlight. Normally a
+                        brightness value of 0 indicates backlight switched off,
+                        and the maximum of the brightness value sets the backlight
+                        to maximum brightness. If this parameter is set to 0
+                        (default) and the machine requires it, or this parameter
+                        is set to 1, a brightness value of 0 sets the backlight
+                        to maximum brightness, and the maximum of the brightness
+                        value switches the backlight off.
+                        -1 -- never invert brightness
+                         0 -- machine default
+                         1 -- force brightness inversion
+
         icn=            [HW,ISDN]
                         Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]