Sto cercando di cambiare la luminosità sovrascrivendo il valore su questo file:
sudo echo 5 > /sys/class/backlight/acpi_video0/brightness
-bash: /sys/class/backlight/acpi_video0/brightness: Permission denied
Non funziona anche quando si usa sudo. Tuttavia, se passo a un superutente con su, funziona. Perché?
The reason that this is set at su permissions is that a virus could conceivably make your screen dim and go bright at incredible speed ultimately damaging your hardware display. In the 90's I encountered a virus that would adjust the screen refresh Hertz so rapidly that your monitor would fry.