linux-kernel - Re: [PATCH 01/14] ACPI / Video: blacklist some samsung laptops

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Message-ID: <20120320163002.GB6811@srcf.ucam.org>
Date:	Tue, 20 Mar 2012 16:30:02 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Corentin Chary <corentin.chary@...il.com>
Cc:	platform-driver-x86@...r.kernel.org, Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/14] ACPI / Video: blacklist some samsung laptops

On Tue, Mar 20, 2012 at 05:28:06PM +0100, Corentin Chary wrote:
> On Tue, Mar 20, 2012 at 5:05 PM, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> > Are the hotkeys delivered via ACPI or via the Samsung device? If the
> > latter, you can just do unregister_acpi_video() instead in the samsung
> > driver and avoid having more machine-specific quirks in the ACPi code.
> 
> I wasn't aware of acpi_video_unregister(). The issue with that
> solution is that it makes it harder to respect acpi_video= parameter.
> 
> On these machines, the ACPI Video device is broken (I don't know how,
> I don't have the hardware, I just know it doesn't work at all), and I
> want the default to be acpi_backlight=vendor, but it is still a good
> idea to let users force acpi_backlight=video.

If it's broken then I don't think there's a great argument for providing 
an argument just to let people re-break their kernel :)

> But if the policy is to use acpi_video_unregister() when the video
> module is known to be broken, let's do that.

As long as ACPI isn't being used to deliver brightness keys, then this 
is fine.

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