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

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Message-ID: <20130326170203.GA23549@srcf.ucam.org>
Date:	Tue, 26 Mar 2013 17:02:03 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Danny Baumann <dannybaumann@....de>
Cc:	David Airlie <airlied@...ux.ie>, intel-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] drm/i915: Allow specifying a minimum brightness
 level for sysfs control.

On Tue, Mar 26, 2013 at 12:48:44PM +0100, Danny Baumann wrote:
> 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.

I'm not quite clear what you mean here. The behaviour of "0" isn't well 
defined for the ACPI backlight driver - it's perfectly reasonable for it 
to turn the backlight off entirely. Anything assuming that "0" is still 
visible is broken.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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