[SOLUTION] Screen brightness control

[LucaCraft89]

To allow control of the brightness of the display you need to load the following kernel modules: pwm-lpss pwm-lpss-platform
and add 3 .bin firmware files.

Here is How

1. Download and copy the firmware files
   commands

mkdir firmware
cd firmware
apt update
apt install wget
wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/dg2_huc_gsc.bin
wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/mtl_guc_70.bin
wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/mtl_huc_gsc.bin
cp *.bin /usr/lib/firmware/i915
# Additionaly remove dir
cd ..
rm -rf firmware

2. Edit boot config

sudo nano /etc/defualt/grub

Where you see GRUB_CMDLINE_LINUX_DEFAULT, comment the line with "#" change it to:

GRUB_CMDLINE_LINUX_DEFAULT="pwm-lpss pwm-lpss-platform quiet splash resume=UUID=ab3b8c33-635c-4af8-bc8a-d1d8546c5ab8"

should look like this:

# GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=<your-UUID>
GRUB_CMDLINE_LINUX_DEFAULT="pwm-lpss pwm-lpss-platform quiet splash resume=UUID=<your-UUID>"

save with CTRL + X then Y then ENTER
3. Update Config
Run

sudo update-grub

4. Reboot

sudo reboot

5. Test
   Open the quick toggle menu in gnome in the top right and see if you can adjust screen brightness with the slider