linux-kernel - Re: Linux 3.11-rc2 [backlight] [ASUS N56VZ]

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Message-ID: <CA+55aFzDgAcrzkkq06Qe9CBbBv6xKMYwPqtwv+ACryRSTRDOSQ@mail.gmail.com>
Date:	Wed, 24 Jul 2013 13:39:35 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	* SAMÍ * <miaousami@...mail.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Aaron Lu <aaron.lu@...el.com>,
	Igor Gnatenko <i.gnatenko.brain@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>
Subject: Re: Linux 3.11-rc2 [backlight] [ASUS N56VZ]

On Wed, Jul 24, 2013 at 12:39 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>
> Well, there seems to be a number of people who'll be equally unhappy if I don't
> do that.  Unfortunately for you, things work for them without that patch.

So I think we have to revert the behavior back, but I wonder if we
could keep the logic and have a i915 kernel command line option to
enable it.

We did that for a long time with "drm.modeset" and the
"i915.enable_rc6" mess. We still have the "i915.invert_brightness"
thing, although I don't know who actually uses it. But that option is
itself an indication that the i915 driver still has some backlight
issues.

But if that kind of "revert behavior" isn't easy, we need to just
revert the patches entirely.

               Linus
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