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

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Message-ID: <CAHR064gLwW32y511tAEf4x59QEaWQzy-i=K7jF8YYC3GS4JHow@mail.gmail.com>
Date:	Tue, 20 Mar 2012 17:28:06 +0100
From:	Corentin Chary <corentin.chary@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
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 5:05 PM, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> On Tue, Mar 20, 2012 at 09:53:01AM +0100, Corentin Chary wrote:
>> From: Corentin Chary <corentincj@...aif.net>
>>
>> On these laptops, the ACPI video is not functional, and very unlikely
>> to be fixed by the vendor. Note that intel_backlight works for some
>> of these laptops, and the backlight from samsung-laptop always work.
>>
>> The good news is that newer laptops have functional ACPI video device
>> and won't end up growing this list.
>
> 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.

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

-- 
Corentin Chary
http://xf.iksaif.net
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