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

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

--- Comment #17 from Johannes P (johannes.penssel@xxxxxxxxx) ---
Looks like the mic mute key and the brightness keys do not behave identically
with the ideapad-laptop module unloaded after all.

While playing around with ACPI EC debugging today, I was able to produce output
for everything (including the otherwise "invisible" KB backlight toggle) except
the brightness keys. This included the mic mute key and other keys reliant on
ideapad-laptop. Without the module, pressing these keys still triggered EC
debug output.

Just as a correction to my above claims.

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