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

[bugzilla-daemon@bugzilla.kernel.org]

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

            Bug ID: 213297
           Summary: ideapad-laptop: DYTC interface not found, several
                    functionalities missing
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.12.8
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Platform_x86
          Assignee: drivers_platform_x86@kernel-bugs.osdl.org
          Reporter: johannes.penssel@gmail.com
        Regression: No

Created attachment 297073
  --> https://bugzilla.kernel.org/attachment.cgi?id=297073&action=edit
hwinfo | grep -i driver output

Device: Lenovo 5 15ITL05(i5-1135G7/GeForceMX450)
Latest UEFI/ME firmware (FHCN41WW/FHME26WW)
Distro: Gentoo (5.10.27 stable and 5.12.8 testing), Arch Linux (5.12.8)

When inserting the ideapad-laptop module: these dmesg log messages occur:

[    2.583728] input: Ideapad extra buttons as
/devices/pci0000:00/0000:00:1f.0/PNP0C09:00/VPC2004:00/input/input3
[    2.583756] ideapad_acpi VPC2004:00: Keyboard backlight control not
available
[    2.590680] ideapad_acpi VPC2004:00: DYTC interface is not available

Result:
-despite the appropriate module being loaded,
/sys/firmware/acpi/platform_profile is missing completely
-backlight brightness control via fn function keys doesn't work
-missing drivers for LUK2019 and IDEA2004 (hwinfo | grep -i driver output is
attached)
-neither xev nor acpid register any inputs from the brightness keys

None of the problems described above occur under Windows 10.

So far, I've tried updating the UEFI/ME FW, switching to LTS kernels and
different distros, as well as the standard workarounds for non-functional fn
keys.

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