linux-kernel - Re: max PWM is zero

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Date:	Sat, 19 Nov 2011 10:50:39 -0800
From:	Keith Packard <keithp@...thp.com>
To:	Marcos Paulo de Souza <marcos.mage@...il.com>,
	linux-kernel@...r.kernel.org
Cc:	airlied@...ux.ie, dri-devel@...ts.freedesktop.org
Subject: Re: max PWM is zero

On Sat, 19 Nov 2011 11:26:07 +0000 (Local time zone must be set--see zic manual page), Marcos Paulo de Souza <marcos.mage@...il.com> 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.

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.

-- 
keith.packard@...el.com

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