From mboxrd@z Thu Jan  1 00:00:00 1970
From: Aaron Lu <aaron.lu@intel.com>
Subject: Re: PROBLEM: [Toshiba Portege Z835] Brightness control lost after
 suspend
Date: Thu, 31 Jul 2014 16:09:48 +0800
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To: John Marsden <john.d.marsden@gmail.com>
Cc: linux-acpi@vger.kernel.org

On Wed, Jul 30, 2014 at 06:11:02PM +0100, John Marsden wrote:
> On 30 July 2014 09:32, Aaron Lu <aaron.lu@intel.com> wrote:
> > Does the other interface work after resume? I mean the intel_backlight
> > and the toshiba one?
> 
> The intel-backlight interface works but the toshiba one does not work.

Please add acpi_backlight=vendor to kernel cmdline and see if that makes
the backlight work. What it does is to tell ACPI video module not to
create the acpi_videoX sysfs interface and let's see if X server will
pick up the intel_backlight one.

Best wishes,
Aaron