From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steven Newbury <steve@snewbury.org.uk>
Subject: Re: Linux 3.11-rc2
Date: Tue, 23 Jul 2013 22:10:38 +0100
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To: Matthew Garrett <matthew.garrett@nebula.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, James Hogan <james@albanarts.com>, Linus Torvalds <torvalds@linux-foundation.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Kamal Mostafa <kamal@canonical.com>, "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>, ACPI Devel Maling List <linux-acpi@vger.kernel.org>

On Tue, 2013-07-23 at 19:51 +0000, Matthew Garrett wrote:
> On Tue, 2013-07-23 at 18:47 +0100, Steven Newbury wrote:
> 
> > In the code as was present in the linux-pm/bleeding-edge tree I would
> > encounter a hard lockup on keyboard brightness trigger.  This also occurred with
> > the code as it initially hit mainline, but a later commit fixed the crash*, but
> > resulted in no backlight controls being available at all.
> > /sys/class/backlight  is empty.
> 
> This is an Intel system using the i915 driver?
> 

Yes, IVB i7-3840QM.  CLEVO W270EUQ.