[Bug 222102] [ASUS Vivobook F1054ZA] Keyboard backlight missing/not working on Fedora 44 KDE - PixArt ASUP1200:00 controller

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=222102

--- Comment #2 from Roberto Comandatore (roberto_comandatore_93@protonmail.com) ---
(In reply to Roberto Comandatore from comment #1)
> Distribution: Fedora Linux 44 (KDE Plasma)
> Kernel version: 7.2.8-200.fc44.x86_64
> 
> Description of Problem:
> The keyboard backlight on the ASUS Vivobook F1054ZA does not turn on. The
> sysfs interface `asus::kbd_backlight` is completely missing from
> `/sys/class/leds/`.
> 
> The keyboard and touchpad are driven by a PixArt I2C-HID controller
> recognized as `ASUP1200:00` (HID ID 093A:200A). The kernel correctly
> registers the keyboard functions via i2c-hid, but does not expose any
> LampArray or LED brightness interfaces.
> 
> Attempts made:
> - Upgraded laptop BIOS to the latest version.
> - Tested OpenRGB and VRGB (devices not found because hidraw/sysfs endpoints
> are missing).
> - Loaded i2c-dev and verified Intel SMBus i801 adapter is fully active.
> - Attempted to pass `acpi_osi="Windows 2020"` and `i2c_hid.polling_mode=0`
> in GRUB parameters, but the HID interface for LEDs remains hidden.
> 
> I am attaching the acpidump, fastfetch summary, dmesg logs, and dmidecode
> details in a compressed archive.
> 
> Cross-reference: Tracking this issue on ASUS-Linux GitLab at
> https://gitlab.com 

Errata corrige for Asus-Linux Gitlab link:
https://gitlab.com/asus-linux/linux-g14/-/work_items/18

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