linux-kernel - Re: [PATCH] Samsung laptop driver

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Date:	Fri, 21 Aug 2009 16:19:52 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Soeren Sonnenburg <bugreports@....de>,
	Jérémie Huchet <jeremie@...ah.info>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [PATCH] Samsung laptop driver

On Fri, 21 Aug 2009 15:59:25 -0700
Greg KH <greg@...ah.com> wrote:
> Jesse, I don't know how this is going to play with your recently added
> backlight support for the i915 driver.  As you don't have control over
> the LEDs and other stuff that this driver is going to support, I think
> we need some way to keep the i915 driver from messing with the
> backlight values, don't you think?

Right, it should be fine.  The i915 driver should only take control and
provide a backlight when:
  - no ACPI method is available
  - no platform method is available (like this one)
  - backlight is exposed through the GPU or i2c

So I'm a lot happier now that you've figured out the proper platform
interface. :)  The test code I sent out earlier didn't work for Mike
because his VBIOS (properly it turns out) indicated that there was an
external agent in charge of the backlight.

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center
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