linux-kernel - [PATCH 0/1] drm/i915: Allow specifying a minimum brightness level for sysfs control.

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Message-Id: <1364298525-4337-1-git-send-email-dannybaumann@web.de>
Date:	Tue, 26 Mar 2013 12:48:44 +0100
From:	Danny Baumann <dannybaumann@....de>
To:	David Airlie <airlied@...ux.ie>
Cc:	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, Danny Baumann <dannybaumann@....de>
Subject: [PATCH 0/1] drm/i915: Allow specifying a minimum brightness level for sysfs control.

This patch makes the behaviour of the intel_backlight backlight device
consistent to e.g. acpi_videoX: When writing the value 0, the set brightness
makes the panel content barely readable instead of turning the backlight off.
This matches the expectations of user space (e.g. kde-workspace or the Intel
X11 driver), which expects that it can use intel_backlight as a drop-in
replacement for acpi_videoX.
As BIOSes written for Windows 8 support seem to expect the display driver
taking care of the brightness control instead of ACPI methods (see [1]),
I would expect quite a number of people (like me ;) ) having the need of
using intel_backlight instead of acpi_videoX. A quick Google search
indicated that most people are confused by the current behaviour, so I think
it's a good idea to make the default behaviour somehow match acpi_videoX.

Regards,

Danny

[1] https://bugzilla.kernel.org/show_bug.cgi?id=55071

Danny Baumann (1):
  drm/i915: Allow specifying a minimum brightness level for sysfs
    control.

 drivers/gpu/drm/i915/intel_panel.c | 48 ++++++++++++++++++++++++++++++++------
 1 file changed, 41 insertions(+), 7 deletions(-)

-- 
1.8.1.4

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