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

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

--- Comment #32 from Hans de Goede (jwrdegoede@xxxxxxxxxxxxxxxxx) ---
(In reply to Johannes Penßel from comment #31)
> Thank you for your help!

You're welcome and thank you for your work on this, your APCI debugging skills
are impressive!

> My understanding of ACPI is limited, but my guess would be that for some
> reason, \_SB.PC00.LPCB.EC0._REG gets evaluated before _SB.PC00._INI, thus
> leaving the former with an incorrect value for OSYS. AFAICT, this does not
> look too dissimilar from the issue in the bugzilla thread you linked.

Yes, I believe that that is what is happening too.

Looking at the code I have an idea how to fix this, I'm testing a patch for
this now (to make sure it does not regress things on other hw, or at least on
my laptop).

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