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

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Message-ID: <1381765708.24317.1.camel@x230.lan>
Date:	Mon, 14 Oct 2013 15:48:28 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	"mzxreary@...inter.de" <mzxreary@...inter.de>
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, 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.

-- 
Matthew Garrett <matthew.garrett@...ula.com>