[Bug 214899] ideapad-laptop: brightness hotkeys not working

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

--- Comment #28 from Johannes P (johannes.penssel@xxxxxxxxx) ---
Finally, I have managed to get the keys working. 

Using ec-dump.exe, I figured out which EC registers hold different values on
Windows compared to Linux. After writing 0x86 to offset 0xA3, (which is 0x80 on
Linux by default) the keys started working instantly, with proper ACPI events
and everything.

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