linux-kernel - Re: [PATCH] acpi/video: Add Lenovo IdeaPad Yoga 13 to acpi video detect blacklist

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Date:	Mon, 14 Oct 2013 18:24:46 +0200
From:	Lennart Poettering <mzxreary@...inter.de>
To:	Matthew Garrett <matthew.garrett@...ula.com>
Cc:	"lenb@...nel.org" <lenb@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"aaron.lu@...el.com" <aaron.lu@...el.com>,
	"rjw@...k.pl" <rjw@...k.pl>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH] acpi/video: Add Lenovo IdeaPad Yoga 13 to acpi video
  detect blacklist

On Mon, 14.10.13 15:48, Matthew Garrett (matthew.garrett@...ula.com) wrote:

> On Mon, 2013-10-14 at 17:36 +0200, Lennart Poettering wrote:
> 
> > Sorry, still not getting this. How should this ever work if the intel
> > video driver is compiled as kmod? That means that it isn't clear at all
> > when the kmod is going to be loaded or if it is loaded at all, you
> > cannot delay the registration of the acpi backlight that long, since the
> > time you'd have to wait is basically unbounded...
> 
> See the intel_opregion_present() code in drivers/acpi/video.c. The ACPI
> driver won't bind to Intel hardware until i915 indicates that it should
> do so.

Hmm, OK, so this means that the acpi backlight will check whether i915
hw is around, and not whether the i915 driver is actually loaded? That
would work for me I guess. Thanks.

That means on win8 machines with win8 graphics there'll always be a
single backlight device in userspace only?

Lennart

-- 
Lennart Poettering - Red Hat, Inc.
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