[Bug 214899] ideapad-laptop: platform backlight device not working

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214899

--- Comment #6 from Johannes P (johannes.penssel@gmail.com) ---
Getting those brightness keys to actually produce key events is something I
have tried unsuccessfully for quite a while now. Having just re-checked all 14
available input devices for good measure with evtest, there is still nothing to
report. Same goes for ACPI and WMI events as far as I can tell. Under Windows,
the brightness keys work without issues.

I have noticed that this is actually very similar to how the microphone mute
key behaves without the ideapad-laptop driver loaded. (i.e. it is virtually
undetectable) The driver exposes this key via the keymap it creates for the
"Ideapad extra buttons" input device. Maybe my brightness keys need to be added
to this keymap as well?

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