linux-kernel - Re: [PATCH 1/3] ACPI: Provide config option to disable BIOS brightness changes on power events

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Message-ID: <20120217193742.GA11132@srcf.ucam.org>
Date:	Fri, 17 Feb 2012 19:37:42 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Pavel Machek <pavel@....cz>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	lenb@...nel.org
Subject: Re: [PATCH 1/3] ACPI: Provide config option to disable BIOS
 brightness changes on power events

On Fri, Feb 17, 2012 at 08:27:04PM +0100, Pavel Machek wrote:
> Hi!
> 
> > The default ACPI behaviour is to instruct the BIOS to automatically change
> > brightness on power events. This may be undesirable for distributions who
> > manage brightness in userspace. Provide a config option that disables this
> > behaviour and leaves brightness control up to the OS.
> 
> Should this be configured during runtime?
> 
> Like... when userspace power management starts, it disables this?

This is ACPI-specific. It's not emulated by any of the other backlight 
drivers. There's no terribly easy way to have generic userspace handle 
it.

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