linux-kernel - Re: [PATCH] acpi: video: improve quirk check

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Message-ID: <CAMP44s0+d2ffXC-k8+kxQ4XCfF8M_VSBZ02M5seDSj99oPkXZw@mail.gmail.com>
Date:	Mon, 5 Aug 2013 09:41:04 -0500
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Aaron Lu <aaron.lwe@...il.com>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH] acpi: video: improve quirk check

On Mon, Aug 5, 2013 at 9:04 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:

>> In my machine I think the issue is slightly different, I think _BCM is
>> failing, at least until enabling the _DOS thing, but at the end of the
>> day it's the same thing for the check; _BQC is always returning the
>> same value, and the code above will find that out, regardless of which
>> values are tested.
>>
>> For my particular machine though, I think it's more interesting to
>> find out why _BCM is failing before _DOS, and why efaa14c made it
>> work. If that is actually the case.
>
> That depends on how the BIOS+platform is designed and that may change from
> one system to another quite a bit.

Maybe, but it seems there's at least another ASUS machine with the
same behavior, and it seems a lot of ASUS machines behave very
similarly.

> The only common denominator is what Windows expects (and that unfortunately
> depends on the version of Windows too), because that's the functionality
> which is likely to have been tested.  Anything else is likely to be untested
> and therefore most probably buggy.

Maybe, or maybe we are doing something wrong.

It's worth to try to find that out.

-- 
Felipe Contreras
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