linux-kernel - Re: max PWM is zero

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Message-ID: <86ipmdgcjo.fsf@sumi.keithp.com>
Date:	Mon, 21 Nov 2011 17:40:11 -0800
From:	Keith Packard <keithp@...thp.com>
To:	Marcos Paulo de Souza <marcos.mage@...il.com>
Cc:	linux-kernel@...r.kernel.org, airlied@...ux.ie,
	dri-devel@...ts.freedesktop.org
Subject: Re: max PWM is zero

On Mon, 21 Nov 2011 22:48:21 +0000 (Local time zone must be set--see zic manual page), Marcos Paulo de Souza <marcos.mage@...il.com> wrote:

> My max_brightness is 1, and my brightness is 0.

Right, we've prevented the internal backlight driver from exposing a max
value of 0 as that's just confusing.

> But, my acpi_video0 have a 
> max_brightness value = 9...

Right, sounds like your device is just using some other backlight
controller, which is perfectly reasonable.

> So, what can I do to silence this warning...? Change the driver of 
> backlight?

If your backlight keys work correctly, then things are fine and perhaps
we should just remove the warning from the driver, or disable the
internal driver when we discover this situation.

This is the first time I've heard of this warning appearing...

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

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