These are the available backlights (which can be written using cat) $ ls /sys/class/backlight/ I tried adding files in /usr/share/X11// as recommended ( nf using both "Backlight" "ideapad" and "intel_backlight", or nf).I tried many boot combinations (yes I updated GRUB and did reboot, as described in this troubleshooting Debugging/Backlight).xdotool key 232 or xdotool key XF86MonBrightnessDown.
with the GUI slider in mate-power-preferences works perfectly.echo 10000 | sudo tee /sys/class/backlight/intel_backlight/brightness and as well.So it is a more low-level issue, I am afraid. However other key combinations like Fn+F3 for volume up is detected by both commands. These keys are not detected at all, neither by xev nor by acpi_listen. On my Lenovo Laptop with Linux Mint the backlight cannot be set using Fn+F6/F7. Being aware of that this is partially a known issue, since each is individual and different, the problem is as following:
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