linux-kernel - Re: [PATCH] video: backlight: Remove backlight sysfs uevent

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Date:	Fri, 22 Nov 2013 17:15:56 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Jingoo Han <jg1.han@...sung.com>,
	'Kyungmin Park' <kmpark@...radead.org>,
	'Henrique de Moraes Holschuh' <ibm-acpi@....eng.br>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kay@...y.org, 'Richard Purdie' <rpurdie@...ys.net>,
	ibm-acpi-devel@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] video: backlight: Remove backlight sysfs uevent

On Fri, Nov 22, 2013 at 09:36:01AM -0200, Henrique de Moraes Holschuh wrote:
> On Thu, 21 Nov 2013, Matthew Garrett wrote:
> > The uevent support was initially added to handle systems where pressing 
> > a hotkey generates an event (good) but the firmware automatically 
> > changes the brightness (bad). I have absolutely no idea why I added 
> > BACKLIGHT_UPDATE_SYSFS - BACKLIGHT_UPDATE_HOTKEY solves the problem I 
> > was trying to solve. I'm not aware of any userspace that relies on 
> > BACKLIGHT_UPDATE_SYSFS.
> 
> Well, either we have userspace that rely on the uevents, or we don't. 

We have userspace that relies on uevents of type 
BACKLIGHT_UPDATE_HOTKEY. I don't know that we have userspace that relies 
on uevents of type BACKLIGHT_UPDATE_SYSFS.

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