From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcos Paulo de Souza Subject: Re: max PWM is zero Date: Mon, 21 Nov 2011 22:48:21 +0000 (Local time zone must be set--see zic manual page) Message-ID: References: <864ny0kku8.fsf@sumi.keithp.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-gy0-f177.google.com (mail-gy0-f177.google.com [209.85.160.177]) by gabe.freedesktop.org (Postfix) with ESMTP id B81839E9C4 for ; Mon, 21 Nov 2011 14:48:48 -0800 (PST) Received: by ghbg15 with SMTP id g15so3893996ghb.36 for ; Mon, 21 Nov 2011 14:48:48 -0800 (PST) In-Reply-To: <864ny0kku8.fsf@sumi.keithp.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: Keith Packard Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org Hi Keith, On Sat, 19 Nov 2011, Keith Packard wrote: > On Sat, 19 Nov 2011 11:26:07 +0000 (Local time zone must be set--see zic manual page), Marcos Paulo de Souza wrote: >> So, anybody gets the same message? >> >> I'm trying the 3.2-rc2 and it gives the same message. >> >> Again, if you need someone to make tests, or test some patches, I'm >> able to do this. > > Is your machine even using the intel backlight device? You can test this > by: > > # cd /sys/class/backlight/intel_backlight > > Then look at 'max_brightness' and try echoing a range of numbers from 0 > to max_brightness into the brightness file and see if it changes the > backlight. My max_brightness is 1, and my brightness is 0. But, my acpi_video0 have a max_brightness value = 9... > It's more than possible that your machine is simply using some other > hardware to drive the backlight and that the integrated backlight > controller is simply disabled. So, what can I do to silence this warning...? Change the driver of backlight? > -- > keith.packard@intel.com >