linux-kernel - Re: [PATCH 2.6.18-mm2] acpi: add backlight support to the sony

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Date:	Tue, 10 Oct 2006 22:32:46 +0800
From:	Yu Luming <luming.yu@...il.com>
To:	Matt Domsch <Matt_Domsch@...l.com>
Cc:	Pavel Machek <pavel@....cz>, Andrew Morton <akpm@...l.org>,
	Alessandro Guido <alessandro.guido@...il.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	len.brown@...el.com, jengelh@...ux01.gwdg.de, gelma@...ma.net,
	ismail@...dus.org.tr
Subject: Re: [PATCH 2.6.18-mm2] acpi: add backlight support to the sony_acpi driver

> > Please move it into the kernel where it belongs, and use lcd
> > brightness subsystem like everyone else.
>
> We've been through this before.
> http://marc.theaimsgroup.com/?l=linux-kernel&m=114067198323596&w=2
>
> In addition, the SMI call used to change the backlight level *may*
> require (if configured by the sysadmin in BIOS), a password be
> entered.
>
> This begs for a common userspace app that can grok libsmbios and
> kernel interfaces both, and use the appropriate method on each, rather
> than just putting it all in the kernel

>From my understanding, a cute userspace App shouldn't have this kind
of logic:
	if (is  DELL )
		invoke libsmbios
	if (is  foo)
		invoke libfoo,
	if (is bar)
		invoke libbar,
	....
	else
		operate on /sys/class/backlight/ ,.,..

It should be:
	just write/read  file in  /sys/class/backlight ,....

Right?

Thanks,
Luming



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