Re: Brightness 100% when connect or disconnect charger

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 can I do to fix this issue?

-- 
Emmanuel Vadot <manu@bidouilliste.com> <manu@freebsd.org>