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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20131014162445.GA11682@tango.0pointer.de>
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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/