[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

--- Comment #4 from Johannes P (johannes.penssel@gmail.com) ---
(In reply to Barnabás Pőcze from comment #3)
> 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.

Thank you for your help! I thought mentioning LHK2019 and IDEA2004 might be
relevant as both platforms load Lenovo-specific drivers in Windows 10, thus I
assumed that they are supposed to do the same in Linux. 
May I ask how you were able to determine the DYTC version on my machine? I have
been unsuccessfully trying to figure it out myself for the last few days.
Thanks!

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