Created attachment 192927 [details]
Verbose boot dmesg.
I'm aware that to control backlight you have to use graphics/intel-backlight (is there any chance to see this exposed to sysctl in the future without needing this kludge?) -- and it works if I bind it to some window manager keys.
However, I can not use the brightness keys via window manager nor devd, because they generate no events at all. I have tried loading different acpi_* kernel modules, and none of them work.
This has always been the case, since version 9, and I have not used any earlier version.
Created attachment 192928 [details]
These errors show up at random, are they relevant?
I forgot to add: brightness works up until the kernel is loader. And the brightness set by intel-backlight does not survive suspend restore -- it is reset to the pre-kernel setting.
> is there any chance to see this exposed to sysctl in the future without needing
> this kludge? [...] I have tried loading different acpi_* kernel modules, and
> none of them work.
On the Lenovo L470 here and fairly recent -CURRENT I can control brightness with sysctl(8) after loading acpi_video(4) module. Also, as of base r360025 brightness change events are visible via devd(8):
> # sysctl hw.acpi.video.lcd0.brightness=85
> hw.acpi.video.lcd0.brightness: 60 -> 85
> $ cat /var/run/devd.pipe
> !system=ACPI subsystem=Video type=brightness notify=85
Your report was against 11.1-RELEASE which is no longer supported. Could you please update to contemporary, supported FreeBSD version and reconduct your tests?
Sorry, have not been using FreeBSD for a long time.
(In reply to Account Removed from comment #6)
Thank you for the report anyway!
Let's reopen this issue if it turns out that the problem is still present.