svn commit: r360025 - head/sys/dev/acpica

[Colin Percival]

On 2020-04-16 23:26, Alexey Dokuchaev wrote:
> 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 at freebsd.org
>>> <mailto:cperciva at 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?

Having occasional extra messages coming through devctl(4) is harmless; by
default devd will just drop them on the floor since there isn't anything
configured to do with them.

In an upcoming change to the graphics/intel-backlight port (if/when someone
merges my patch into their github repo...) I'll be providing a configuration
file which can be copied into /usr/local/etc/devd/ in order to hook these
messages up to the intel-backlight utility.

So... yes, for practical purposes this is disabled by default.

-- 
Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid