[Bug 216150] ideapad-laptop exposes only two keyboard backlight levels, instead of three

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216150

Barnabás Pőcze (pobrn@protonmail.com) changed:

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                 CC|                            |pobrn@protonmail.com

--- Comment #1 from Barnabás Pőcze (pobrn@protonmail.com) ---
From https://bugzilla.redhat.com/show_bug.cgi?id=1979909:

> Hi
> 
> This is a limitation of the interface. The device I tested this feature on
> also has three keyboard backlight levels that can be changed using Fn+space,
> however, the Lenovo Vantage software on Windows can only turn it on/off,
> because the that's all the interface is capable of. And since I based my work
> on that, this limitation is carried over to the Linux kernel driver. If I
> recall correctly there is another interface that has multiple backlight
> levels, but my device was not compatible so I didn't attempt to implement
> that. Curiously, the backlight change notification is still sent.

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