linux-kernel - Re: [PATCH] Added backlight driver for Acer Aspire 4736

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Message-ID: <20120312175130.GA18002@srcf.ucam.org>
Date:	Mon, 12 Mar 2012 17:51:30 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Pradeep Subrahmanion <subrahmanion.pradeep@...il.com>
Cc:	rpurdie@...ys.net, FlorianSchandinat@....de,
	akpm@...ux-foundation.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Added backlight driver for Acer Aspire 4736

On Mon, Mar 12, 2012 at 11:12:17PM -0400, Pradeep Subrahmanion wrote:
> Hi ,
> 
>   Brightness control was not  working on Acer Aspire 4736 using default ACPI interface.  acer-acpi also do not support 4730 series since it uses new WMI interface.
> This driver adds brightness control by accessing the LBB PCI configuration register. This approach may also work on other laptops in 4730 series .But currently ,  it is only tested  for 
> Aspire 4736. 

1) If there's a WMI interface to brightness control, why not use that?
2) You're hitting a hardware resource that belongs to the i915 driver, 
which may well cause problems.
3) Why does the ACPI interface not work? Can you attach the acpidump 
output?

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