This is what happens when I tried "echo 5 > sudo tee /sys/class/backlight/acpi_video0/brightness". It instantly froze everything except the mouse pointer, which froze after about 10 seconds as well. You can see lots of erros in the log file.
This is what happens when I tried "echo 5 > sudo tee /sys/class/ backlight/ acpi_video0/ brightness" . It instantly froze everything except the mouse pointer, which froze after about 10 seconds as well. You can see lots of erros in the log file.