linux-kernel - Re: [PATCH] Rationalise ACPI backlight implementation

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Message-ID: <20080128052804.GA26091@srcf.ucam.org>
Date:	Mon, 28 Jan 2008 05:28:05 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH] Rationalise ACPI backlight implementation

On Sun, Jan 27, 2008 at 09:10:13PM -0800, Andrew Morton wrote:

> You cannot seriously tell me that if we are to change this range from 0-8
> up to 0-100 then this is not a backwards-incompatible change in
> semantics.

We're talking about changing 0-100 to 0-something sane, because the 
current driver is quite clearly broken. And yes, I'm perfectly happy to 
say that - the reason that max_brightness is exported is to allow 
userspace to determine what range of values is acceptable, and if 
userspace ignores that then things are going to break for it at some 
point.

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