linux-kernel - Re: [PATCH v5 0/4] Fix Win8 backlight issue

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Date:	Sat, 12 Oct 2013 08:00:23 +0200
From:	Yves-Alexis Perez <corsac@...ian.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	Aaron Lu <aaron.lu@...el.com>, linux-acpi@...r.kernel.org,
	intel-gfx@...ts.freedesktop.org,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel@...ll.ch>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Lee Chun-Yi <joeyli.kernel@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Igor Gnatenko <i.gnatenko.brain@...il.com>,
	Felipe Contreras <felipe.contreras@...il.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Ben Jencks <ben@...ncks.net>,
	Steven Newbury <steve@...wbury.org.uk>,
	James Hogan <james@...anarts.com>,
	Kamal Mostafa <kamal@...onical.com>,
	Joerg Platte <jplatte@...sa.net>,
	Kalle Valo <kvalo@...rom.com>,
	Martin Steigerwald <Martin@...htvoll.de>,
	Jörg Otte <jrg.otte@...il.com>,
	Mike Galbraith <bitbucket@...ine.de>,
	platform-driver-x86@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.i>
Subject: Re: [PATCH v5 0/4] Fix Win8 backlight issue

On sam., 2013-10-12 at 00:10 +0200, Rafael J. Wysocki wrote:
> On Friday, October 11, 2013 12:42:43 PM Josh Boyer wrote:
> > On Fri, Oct 11, 2013 at 9:27 AM, Aaron Lu <aaron.lu@...el.com> wrote:
> > > v5:
> > > 1 Introduce video.use_native_backlight module parameter and set its
> > >   value to false by default as suggested by Rafael. For Win8 systems
> > >   which have broken ACPI video backlight control, the parameter can be
> > >   set to 1 in kernel cmdline to skip registering ACPI video's backlight
> > >   interface. Due to this change, the acpi_video_verify_backlight_support
> > >   is moved from video_detect.c to video.c - patch 3/4;
> > 
> > That's a fairly untenable position for distro kernels to be in.  They
> > now have to ask every user that reports an issue with the backlight to
> > try setting that option on the command line.  While I appreciate the
> > setting breaks things for some people, doesn't the Win8 issue impact
> > far more people?  Shouldn't it be defaulted to true?
> 
> Well, we have a rule in the kernel not to introduce regressions for users even
> if they are minority.

Well, for some users, the regression actually happened when support for
Win8 OSI call was introduced.

Regards,
-- 
Yves-Alexis

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