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SubjectRe: [PATCH 01/14] ACPI / Video: blacklist some samsung laptops
On Tue, Mar 20, 2012 at 5:05 PM, Matthew Garrett <> wrote:
> On Tue, Mar 20, 2012 at 09:53:01AM +0100, Corentin Chary wrote:
>> From: Corentin Chary <>
>> 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

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