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

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Message-ID: <CAOzJMDQwte=7VtfQzW9DyQpt+pbe48STDEGhLis62Y0tG78G1w@mail.gmail.com>
Date:	Sun, 4 Aug 2013 09:47:12 +0800
From:	Aaron Lu <aaron.lwe@...il.com>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel development list <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 Sun, Aug 4, 2013 at 6:20 AM, Felipe Contreras
<felipe.contreras@...il.com> wrote:
> On Sat, Aug 3, 2013 at 4:40 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>> On Saturday, August 03, 2013 03:24:16 PM Felipe Contreras wrote:
>>> On Sat, Aug 3, 2013 at 6:34 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>>> > On Saturday, August 03, 2013 04:14:04 PM Aaron Lu wrote:
>>>
>>> >> Yes, the patch is correct, but I still prefer my own version :-)
>>> >> https://github.com/aaronlu/linux/commit/0a3d2c5b59caf80ae5bb1ca1fda0f7bf448b38c9
>>> >>
>>> >> In case you want to take mine and mine needs refresh, please let me know
>>> >> and I can do the re-base, thanks.
>>> >
>>> > Well, I prefer simpler, unless there's a good reason to use more complicated.
>>>
>>> Note that these are not exclusionary; his patch can be applied on top
>>> of mine. I don't think his patch is needed though.
>>
>> OK
>>
>> Do we still need to revert commit efaa14c if this patch is applied?
>
> I guess not. At least in this machine changing the backlight works
> correctly, whereas in v3.11-rc3 it was all weird, and v3.7-v3.10
> didn't work at all. I cannot see how it would affect negatively other
> machines.

That commit makes hotkey emit notifications, and it's not the
problem of "booting into a black screen", that problem is due to
broken _BQC.

BTW, the efaa14c will also make screen off at level 0 according
to Felipe, who consider this is a bug. But since it is required to
let firmware emit notifications on hotkey press, I think user will
want it.

-Aaron

>
> That being said, the blacklisting is still needed, because 1. the
> level is not preserved between boots, and 2. level 0 turns off the
> screen, which I personally consider a regression.
>
> At least it boots to level 100 instead of 0.
>
> --
> Felipe Contreras
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