SOLVED Impossible to change the brightness
UPDATE: 27082022 Source: Ask Ubuntu This made the job with Vorago Stela100 in Debian 11: sudo vi /usr/share/X11/xorg.conf.d/20-intel.conf: # begin file contents Section "Device" Identifier "card0" Driver "intel" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0" EndSection # end file contents sudo vi /etc/default/grub: GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi= pci=noaer" sudo update-grub o0o Yes yes yes! I'm happy: this works for me (using Debian): sudo vim /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_osi=Linux acpi_backlight=video" GRUB_CMDLINE_LINUX="" sudo update-grub sudo reboot ACPI error messages still persists when the system startup (AE_NOT_FOUND), but Fn+F11 and Fn+F12 keys are driving the brightness correctly. When I type in the command line this: ~$ for i in /sys/class/backlight/*; do echo -e "\n $i"; cat $i/{brightness,max_brightness,actual_brightness}; do...