From e1eb40b7e10a98a0895aaf7c78580e89fc494375 Mon Sep 17 00:00:00 2001 From: Carsten Emde Date: Thu, 15 Mar 2012 15:56:26 +0100 Subject: drm/i915: panel: invert brightness via quirk commit 4dca20efb1a9c2efefc28ad2867e5d6c3f5e1955 upstream. A machine may need to invert the panel backlight brightness value. This patch adds the infrastructure for a quirk to do so. Signed-off-by: Carsten Emde Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter Acked-by: Jani Nikula Signed-off-by: Ben Hutchings --- Documentation/kernel-parameters.txt | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) (limited to 'Documentation') diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index d44116b..897f223 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -948,14 +948,19 @@ 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 + i915.invert_brightness= [DRM] Invert the sense of the variable that is used to set the brightness of the panel backlight. Normally a - value of 0 indicates backlight switched off, and the - maximum value sets the backlight to maximum brightness. - If this parameter is specified, a value of 0 sets the - backlight to maximum brightness, and the maximum value - switches the backlight off. + 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: [,[,[,]]] -- cgit v1.1