linux-kernel - Re: linux-next 20160512 - ACPI issue with screen brightness

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Message-ID: <6459.1463698397@turing-police.cc.vt.edu>
Date:	Thu, 19 May 2016 18:53:17 -0400
From:	Valdis.Kletnieks@...edu
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Aaron Lu <aaron.lu@...el.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: linux-next 20160512 - ACPI issue with screen brightness

On Tue, 17 May 2016 22:50:11 +0200, "Rafael J. Wysocki" said:
> On Tue, May 17, 2016 at 8:41 PM, Valdis Kletnieks <Valdis.Kletnieks@...edu> wrote:
> > next-20160512 sets the screen brightness to about 40%-ish or so, rather
> > than the 100% intensity I want.
> >
> > Dell Latitude E6530 laptop.
> >
> > git bisect tells me:
> >
> > 059500940defe285222d3b189b366dfe7f299cae is the first bad commit
> > commit 059500940defe285222d3b189b366dfe7f299cae
> > Author: Aaron Lu <aaron.lu@...el.com>
> > Date:   Wed Apr 27 20:45:04 2016 +0800
> >
> >     ACPI/video: export acpi_video_get_levels
> >
> >     The acpi_video_get_levels is useful for other drivers, i.e. the
> >     to-be-added int3406 thermal driver, so export it.
> >
> >     Signed-off-by: Aaron Lu <aaron.lu@...el.com>
> >     Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >
> > :040000 040000 24f4f5abe8beda2fa219dee7549faacc2f63e29fdfbe3a3bb4f58d82d5be768263d91172276fed98 M      drivers
> > :040000 040000 603ffbf36e76717fe4f4ecb0418c9dbc59c76e25a559bcd81c949a6471ffd045866df9b4e3fa4406 M      include
> >
> >
> > but I've stared at the code and don't see what would do this....
>
> Please try to check out the acpi-video branch from linux-pm.git and
> see if the problem is present then.  If it is, please revert all of
> the top-most commits up to and including the above one and see if the
> problem goes away.

Put this one in the "things that go bump in the night" pile - the problem
doesn't manifest on next-20160519, even though the commit I bisected to
is in the tree for today, and I don't see any obvious smoking guns to
have fixed it in the past week's worth of 'git log'....


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