Re: Brightness 100% when connect or disconnect charger

In message <20231109091931.983f45f8fad4305569faddcb@bidouilliste.com>, 
Emmanuel
 Vadot writes:
> On Wed, 8 Nov 2023 21:57:21 +0200
> "Dr. Amr Osman" <dr3mro@gmail.com> wrote:
>
> > Hello,
> > I have installed freeBSD 14rc4 on Lenovo Thinkpad x270 and xfce desktop and
> > when I
> > 1) connect the charger
> > 2) disconnect the charger
> > 3) resume from suspend
> > The LCD brightness is 100% which is really disturbing specially when I am
> > in dark room
>
>  I don't have the issue on my Thinkpad X390 with suspend/resume but I
> do have it with the charger.
>  I'm pretty sure that it's a hardware thing and we can't do anything
> about it without having some framework for sensors that can handle
> power supply connection/disconnection and events.
>
> > hw.acpi.video.lcd0.economy: 20
> > hw.acpi.video.lcd0.fullpower: 30
> > I have loaded acpi_video and acpi_ibm
> > and if I tried to adjust brightness it goes suddenly from 100 to 20 if I
> > press fn +f5/f6
>
>  You shouldn't need to load acpi_video on modern laptop, backlight(9)
> and backlight(8) is enought (if you have drm loaded).

What I'm about to discuss is not a backlight issue but a unplug the power 
supply and plug it back in issue on my Acer 4752.

When 9a4bc5208fad (acpica: Import ACPICA 20221020) was committed, WOL no 
longer worked on my Acer 4752.

Howerver after I unplugged it from the power supply and plugged it back in, 
only then would it recognize the WOL packet. This was a regression in 
9a4bc5208fad. (I did create a local patch to revert part of 9a4bc5208fad.)

Probably not a FreeBSD issue per se but acpica contrib issue.


-- 
Cheers,
Cy Schubert <Cy.Schubert@cschubert.com>
FreeBSD UNIX:  <cy@FreeBSD.org>   Web:  https://FreeBSD.org
NTP:           <cy@nwtime.org>    Web:  https://nwtime.org

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