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

[bugzilla-daemon@kernel.org]

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

--- Comment #30 from Hans de Goede (jwrdegoede@fedoraproject.org) ---
If it turns out that the issue is that for some reason the "Local0 = 0x06" part
of:

                    If ((OSYS == 0x07DF))
                    {
                        Local0 = 0x06
                    }

Does not execute then this is similar to:
https://bugzilla.redhat.com/show_bug.cgi?id=1842039

Which is also caused by an OSYS check for some reason not working. Note OSYS
gets set to 0x07DF this bit of DSDT code:

                If (_OSI ("Windows 2015"))
                {
                    OSYS = 0x07DF
                }

Which should run early on, but on the 1842039 this for some reason is not
working.

For some more background info, Linux will answer true for _OSI ("Windows 2015")
which is asking the OS if it is "Windows 10", or IOW if it can handle modern
ACPI features, which Linux can.

So assuming that this is the cause of 0xA3 is not being set to 0x86 (*), then
getting to the bottom of this is definitely interesting.

*) Note I'm not even sure that the OSTY reference to address 0xFE0B04A3 is the
A3 we are looking for ...

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