[Bug 213297] ideapad-laptop: DYTC interface not found, several functionalities missing

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=213297

Barnabás Pőcze (pobrn@protonmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |pobrn@protonmail.com

--- Comment #3 from Barnabás Pőcze (pobrn@protonmail.com) ---
As for /sys/firmware/acpi/platform_profile, the issue is very possible the same
as https://bugzilla.kernel.org/show_bug.cgi?id=212985 , that is, the driver
only supports DYTC 5 and above, but it seems from the DSDT that version 4 is
available on that machine.

As for the keyboard backlight, it's not available because the driver only
supports and older version of the keyboard backlight control interface which
does not seem to be available.

As for "LUK2019" and "IDEA2004", those devices don't seem to be that
interesting (I might be wrong though) at first glance since they seem to
contain more or less nothing as far as I can see:

            Device (HKDV)
            {
                Name (_HID, "LHK2019")  // _HID: Hardware ID
                Name (_UID, Zero)  // _UID: Unique ID
                Method (_STA, 0, NotSerialized)  // _STA: Status
                {
                    Return (0x0F)
                }
            }

            ...

            Scope (^^EC0)
            {
                Device (ITSD)
                {
                    Name (_HID, "IDEA2004")  // _HID: Hardware ID
                    Method (_STA, 0, NotSerialized)  // _STA: Status
                    {
                        Return (0x0F)
                    }
                }
            }

As for the, I assume, screen backlight and Fn keys, unfortunately I cannot
help.

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