Date: Fri, 10 Feb 2006 13:21:31 +0100
From: Pavel Machek <pavel@suse.cz>
To: Gabor Gombas <gombasg@sztaki.hu>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>, Greg KH <greg@kroah.com>,
       linux-pm@lists.osdl.org, linux-acpi@vger.kernel.org,
       linux-kernel@vger.kernel.org
Subject: Re: [linux-pm] Re: [PATCH, RFC] [1/3] Generic in-kernel AC status
Message-ID: <20060210122131.GC4974@elf.ucw.cz>
References: <20060208125753.GA25562@srcf.ucam.org> <20060208130422.GB25659@srcf.ucam.org> <20060208165803.GA15239@kroah.com> <20060208170857.GA29818@srcf.ucam.org> <20060209085344.GF16052@boogie.lpds.sztaki.hu>
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On Čt 09-02-06 09:53:44, Gabor Gombas wrote:
> On Wed, Feb 08, 2006 at 05:08:58PM +0000, Matthew Garrett wrote:
> 
> > The backlight interface only supports exporting and setting the current 
> > brightness. For various bits of hardware, the AC and DC brightnesses are 
> > stored separately. Drivers would need to know which brightness value to 
> > export to userspace. I have an HP backlight driver here which would 
> > benefit from this, and I'm looking at the same issue for a Panasonic 
> > one.
> 
> I don't know the backlight interface but extending it to export all
> available brightness values would seem more logical to me.
> 
> If I'd had a laptop I'd hate if I could only set the DC brightness if I
> plug out the AC power.

Still "set current brightness" operation makes a lot of sense.
								Pavel
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