[Bug 218901] New: LG Gram Laptop Extra Features not working on 2024 models (16Z90S)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218901

            Bug ID: 218901
           Summary: LG Gram Laptop Extra Features not working on 2024
                    models (16Z90S)
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.9,6.9.2,6.10-rc1
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Platform_x86
          Assignee: drivers_platform_x86@kernel-bugs.osdl.org
          Reporter: agathe@boutmy.com
        Regression: No

On a 2024 LG Gram laptop, while the year is correctly identified by lg-laptop:
`[   12.865584] [    T528] lg_laptop: product: 16Z90S-G.AD7BF  year: 2022
`
some functionnalities such as battery charge limit and reader mode do not work.
The only error I have found so far is in dmesg: ```[   26.841164] [    T837]
lg_laptop: Cannot get handle
[   26.865830] [   T1167] lg_laptop: Cannot get handle
```
it seems to be related to ACPI as this is what is returned here:
https://github.com/torvalds/linux/blob/master/drivers/platform/x86/lg-laptop.c#L106
(among other emplacements in the code)

Trying to read the value in
`/sys/devices/platform/lg-laptop/battery_care_limit` or
`/sys/class/power_supply/BAT0/charge_control_end_threshold` results in a `cat:
/sys/class/power_supply/BAT0/charge_control_end_threshold: Input/output error
` in both cases and trying to write 80 or 100 returns the same error.
this also happens for `reader_mode`, `fan_mode`, `usb_charge` and `fn_lock`.
I have not tried the other variables but the keyboard lightning does not seem
to be impacted by this.

I have tried on both new installations of Manjaro and Fedora as well as Fedora
Rawhide and Manjaro with a 6.9.2 kernel and 6.10-rc1 kernel freshly compiled.

A colleague has the 2023 version of the laptop and the issue is not present on
kernel 6.9.1.

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