Bug 227869 - Backlight brightness media keys are not working on Lenovo B570e (although backlight brightness can be controlled via intel_backlight)
Summary: Backlight brightness media keys are not working on Lenovo B570e (although bac...
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 11.1-RELEASE
Hardware: Any Any
: --- Affects Only Me
Assignee: freebsd-bugs mailing list
Keywords: needs-qa
Depends on:
Reported: 2018-04-30 12:46 UTC by Michael Danilov
Modified: 2018-05-01 00:39 UTC (History)
2 users (show)

See Also:

Verbose boot dmesg. (60.06 KB, text/plain)
2018-04-30 12:46 UTC, Michael Danilov
no flags Details
ACPI errors (642 bytes, text/plain)
2018-04-30 12:50 UTC, Michael Danilov
no flags Details

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Description Michael Danilov 2018-04-30 12:46:25 UTC
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.
Comment 1 Michael Danilov 2018-04-30 12:50:20 UTC
This has always been the case, since version 9, and I have not used any earlier version.
Comment 2 Michael Danilov 2018-04-30 12:50:53 UTC
Created attachment 192928 [details]
ACPI errors

These errors show up at random, are they relevant?
Comment 3 Michael Danilov 2018-04-30 16:27:01 UTC
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.
Comment 4 Michael Danilov 2018-04-30 16:27:18 UTC
is loaded*