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Date: Fri, 17 Apr 2020 06:26:36 +0000
From: Alexey Dokuchaev <danfe@freebsd.org>
To: Colin Percival <cperciva@freebsd.org>
Cc: Oliver Pinter <oliver.pntr@gmail.com>,
 "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>,
 "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>,
 "src-committers@freebsd.org" <src-committers@freebsd.org>
Subject: Re: svn commit: r360025 - head/sys/dev/acpica
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On Thu, Apr 16, 2020 at 03:12:15PM -0700, Colin Percival wrote:
> On 2020-04-16 15:05, Oliver Pinter wrote:
> > On Thursday, April 16, 2020, Colin Percival <cperciva@freebsd.org
> > <mailto:cperciva@freebsd.org>> wrote:
> >     Log:
> >       Alert devd when acpi_video brightness changes
> > 
> > Please add this to release notes!
> 
> I considered that, but so far I don't have any evidence that other
> systems exist with the same half-working ACPI.  Unless you're aware of
> people who are seeing the same "hw.apci.video.lcd0.brightness changes
> but thebacklight doesn't" syndrome?

So this is more like a work-around for the problem which lies elsewhere:
something is missing in acpi_video(4) or perhaps we need a (nonexistent)
acpi_dell(4)?  In this case, shouldn't it be disabled by default, or at
least be toggable since as you say, evidently just a minority of systems
exist with the same half-working ACPI?

./danfe