Dell XPS 9360 FN brightness keys not detected Manjaro

I have Manjaro installed in dual boot on a Dell XPS 9360 with FHD screen non touchscreen. The key combo to increase/decrease the screen brightness are Fn+F11 and Fn+F12. This works perfectly on Windows 11 and Ubuntu but not on Manjaro So far I can adjust the brightness from the slider in the notification area of the top bar (I'm using Gnome with Wayland, same as ubuntu where Fn key combo it works perfectly also for brightness; on X I have the same problem so it's not some wayland related issue) and adjust it through /sys/class/backlight/intel_backlight/brightness I can also change the brightness through xbacklight, but still not with Fn key combo Looks like that the Fn+F key combo is not detected at all, like it's not registered anywhere - in xev the pushing of Fn+F11 or F12 isn't even detected - acpi_listen reports 9 DBB5994-A997- 000000d0 00000000 for both Fn+F11 and Fn+F12; at least it detects something but I know it's not the right thing as if I push Fn+F3 (to increase the spearkers volume) it gives button/volumeup VOLUP 00000080 00000000 K meaning that it somehow associates that key combo to a specific event/action. 9 DBB5994-A997- 000000d0 00000000 is the same result if I push Fn+F10 which is the combo to adjust keyboard brightness, but this works flawlessly I've also tried the following, without any success - add acpi_backlight=none, acpi_backlight=vendor, acpi_backlight=video and acpi_backlight=native to /etc/default/grub in the section GRUB_CMDLINE_LINUX_DEFAULT - add acpi_osi= and acpi_osi=Linux alone and in combination with one of the previous keys to GRUB_CMDLINE_LINUX_DEFAULT; to be honest I've not tried all the combinations (as suggested [here](https://askubuntu.com/questions/142017/brightness-keys-f4-and-f5-not-working-on-dell-xps-15-6-laptop) for example), so you tell me if it's the case - configure /usr/share/X11/xorg.conf.d/20-intel.conf as auggested [here](https://www.reddit.com/r/archlinux/comments/clj91c/brightness_buttons_stopped_working_dell_xps_15/) but nothing Thank you for your help