linux-kernel - Re: [REGRESSION/PATCH] acpi: blacklist win8 OSI for ASUS Zenbok Prime UX31A

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Message-ID: <CAMP44s2OOX8=tumzwiK3_PRJCxfLfDECrz3dPbzNPiUOuYT8TA@mail.gmail.com>
Date:	Thu, 1 Aug 2013 13:11:31 -0500
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Aaron Lu <aaron.lwe@...il.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Len Brown <lenb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [REGRESSION/PATCH] acpi: blacklist win8 OSI for ASUS Zenbok Prime UX31A

On Thu, Aug 1, 2013 at 1:01 PM, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> On Thu, Aug 01, 2013 at 12:50:18PM -0500, Felipe Contreras wrote:
>> On Thu, Aug 1, 2013 at 12:42 PM, Matthew Garrett <mjg59@...f.ucam.org> wrote:
>> > An interface that describes reality is better than one that doesn't. But
>> > hey, feel free to disagree and post a patch for the ABI docs.
>>
>> An interface that is useful to the user is better than one that is not.
>
> The interface is useful.

Not 100% useful.

If you are going to claim that 99% true is not true, then useful but
inconsistent is not useful.

I think it is useful, and I think it can be consistent if we want it to.

> There are plenty of machines out there that
> disable the backlight at minimum brightness setting (see every Apple,
> for example), and assuming otherwise has always been incorrect. But,
> like I said, send the patch.

The key word in "every Apple" is *every*; what level 0 does in every
apple is consistent. If 0 should turn off the screen, it should do so
on all Linux machines.

I will investigate and prepare an update to the documentation and the
quirks to do so.

-- 
Felipe Contreras
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