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Brightness function keys not working in 22.04

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I recently updated the BIOS (1.30.0) of my Dell Latitude 5480 laptop running with Ubuntu 22.04.
Now the screen is darker (I can see the change while booting) and even xrandr --output eDP-1 --brightness 1 doesn't fix the problem.
It turns out that now all the function keys work except for the brighness ones.
So here are the solutions I've tried so far:

1:

sudo vim /usr/share/X11/xorg.conf.d/20-intel.conf

Section "Device"   
        Identifier  "card0"   
        Driver      "intel"   
        Option      "Backlight"  "intel_backlight"   
        BusID       "PCI:0:2:0"   
EndSection

2:

sudo vim /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

sudo update-grub

3:

sudo vim /etc/modprobe.d/framework-als-blacklist.conf

blacklist hid_sensor_hub

sudo update-initramfs -u

None of these have worked for me.
Any idea ?

I sit in a Tesla and translated this thread with Ai:

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