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| author | Carsten Emde <C.Emde@osadl.org> | 2012-03-15 15:56:26 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-03-18 21:48:18 +0100 |
| commit | 4dca20efb1a9c2efefc28ad2867e5d6c3f5e1955 (patch) | |
| tree | 807c4807c91bf53db35fd28e05eaeaa846d41bde /Documentation/kernel-parameters.txt | |
| parent | 7bd90909bbf9ce7c40e1da3d72b97b93839c188a (diff) | |
| download | lwn-4dca20efb1a9c2efefc28ad2867e5d6c3f5e1955.tar.gz lwn-4dca20efb1a9c2efefc28ad2867e5d6c3f5e1955.zip | |
drm/i915: panel: invert brightness via quirk
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 <C.Emde@osadl.org>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 9f6ba8fab088..da449991e8ae 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -967,14 +967,19 @@ 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: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] |