linux-kernel - Re: [Intel-gfx] [PATCH] i915: Add native backlight control

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Date:	Thu, 9 Sep 2010 18:14:09 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	linux-kernel@...r.kernel.org,
	intel-gfx <intel-gfx@...ts.freedesktop.org>
Subject: Re: [Intel-gfx] [PATCH] i915: Add native backlight control

On Thu, Sep 09, 2010 at 06:09:40PM +0100, Chris Wilson wrote:
> On Wed,  8 Sep 2010 12:32:18 -0400, Matthew Garrett <mjg@...hat.com> wrote:
> > Not all systems expose a firmware or platform mechanism for changing the
> > backlight intensity on i915, so add native driver support.
> 
> This will conflict with a similar patch I have in drm-intel-next to unify
> the various bits of code that were attempting to modify the BLC PWM, each
> in their own unique fashion.
> 
> I'll respin this native interface on top of that. Do you want to add a
> native RAW interface all in one go, or to base it on the current
> backlight_device and then to add the RAW property with this patch set?

I don't think providing a native interface in i915 is beneficial without 
providing the type information - userspace just doesn't have any way to 
identify the correct device otherwise.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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