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

[bugzilla-daemon@kernel.org]

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

--- Comment #97 from Evgeny Ch (chgenn.x@gmail.com) ---
Kernel:
```
$ uname -a
Linux egramm16 7.0.0-22-generic #22-Ubuntu SMP PREEMPT_DYNAMIC Mon May 25
15:54:34 UTC 2026 x86_64 GNU/Linux
```

Below is unloading existing module and loading newly built kernel module with
corresponding dmesg lines:

```
$ sudo rmmod lg-laptop
...
[   45.626554] ACPI: battery: hook unregistered: LG Battery Extension
```

```
$ sudo insmod lg-laptop.ko
...
[   49.458182] ACPI Error: No handler for Region [XIN1] (00000000a791ccde)
[UserDefinedRegion] (20251212/evregion-131)
[   49.458190] ACPI Error: Region UserDefinedRegion (ID=143) has no handler
(20251212/exfldio-261)

[   49.458194] 
               Initialized Local Variables for Method [_TMP]:
[   49.458195]   Local0: 00000000181944fd <Obj>           Integer
000000000000002B

[   49.458198] No Arguments are initialized for method [_TMP]

[   49.458200] ACPI Error: Aborting method \_SB.PC00.LPCB.LGEC.SEN2._TMP due to
previous error (AE_NOT_EXIST) (20251212/psparse-529)
[   52.957699] lg_laptop: loading out-of-tree module taints kernel.
[   52.957705] lg_laptop: module verification failed: signature and/or required
key missing - tainting kernel
[   52.958770] lg_laptop: product: 16Z90Q-R.APB9U1  year: 2022
[   52.965668] LG Gram Laptop Support LGEX0820:00: LED status: 1408
[   52.965871] input: LG WMI hotkeys as
/devices/platform/LGEX0820:00/input/input19
[   52.966015] ACPI: battery: new hook: LG Battery Extension
```

After module loading I've tried keyboard backlight control via keyboard hot
key. Hot key works correctly the same 3 states way. However, no Gnome UI popup
appears and UI brightness control slider doesn't work. This could be because of
unloading old module first, but I'm not sure. dmesg lines below:
```
[  286.267434] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  286.272300] LG Gram Laptop Support LGEX0820:00: LED status: 1442
[  287.396406] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  287.401024] LG Gram Laptop Support LGEX0820:00: LED status: 1444
[  288.373465] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  288.379055] LG Gram Laptop Support LGEX0820:00: LED status: 1408
[  289.612409] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  289.617677] LG Gram Laptop Support LGEX0820:00: LED status: 1442
[  290.947406] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  290.953464] LG Gram Laptop Support LGEX0820:00: LED status: 1444
[  292.272403] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  292.276761] LG Gram Laptop Support LGEX0820:00: LED status: 1408
[  294.229342] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  294.234591] LG Gram Laptop Support LGEX0820:00: LED status: 1442
[  296.707288] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  296.712731] LG Gram Laptop Support LGEX0820:00: LED status: 1444
[  297.680322] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  297.685602] LG Gram Laptop Support LGEX0820:00: LED status: 1408
[  299.880236] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  299.885493] LG Gram Laptop Support LGEX0820:00: LED status: 1442
[  301.537256] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  301.543016] LG Gram Laptop Support LGEX0820:00: LED status: 1444
[  302.174996] kauditd_printk_skb: 11 callbacks suppressed
[  302.174999] audit: type=1400 audit(1781336673.678:385): apparmor="AUDIT"
operation="userns_create" class="namespace" info="Userns create - transitioning
profile" profile="unconfined" pid=9982 comm="(ubuntu-insigh)"
requested="userns_create" target="unprivileged_userns"
execpath="/usr/lib/systemd/systemd-executor"
[  302.175500] audit: type=1400 audit(1781336673.678:386): apparmor="DENIED"
operation="capable" class="cap" profile="unprivileged_userns" pid=9982
comm="(ubuntu-insigh)" capability=21  capname="sys_admin"
[  302.208756] audit: type=1400 audit(1781336673.712:387): apparmor="DENIED"
operation="getattr" class="file" info="Failed name lookup - disconnected path"
error=-13 profile="unprivileged_userns" name="" pid=9989 comm="systemd-detect-"
requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[  302.649150] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  302.655875] LG Gram Laptop Support LGEX0820:00: LED status: 1408
[  320.042802] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  320.048202] LG Gram Laptop Support LGEX0820:00: LED status: 1442
[  320.837776] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  320.842977] LG Gram Laptop Support LGEX0820:00: LED status: 1444
[  322.041760] LG Gram Laptop Support LGEX0820:00: Received event 130
(268435456)
[  322.047132] LG Gram Laptop Support LGEX0820:00: LED status: 1408
```

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