to adjust the brigtness of the screen

Hello, ls -al /sys/class//backlight/ intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight ls -al /sys/class/backlight/acpi_video0/ no file xbacklight is installed. To adjust the brigtness : Menu => Trinity Configuration Center => Périphériques => Hardware Device Manager => Backlight => Intel HD Graphics 520 and I can adjust the brightness from 0 to 100%, but the value is not keeped if I close the session. The default value = 62% This is the situation. Regards, André