I have that file, but setting that value to 10 is the same as going to Screen GUI and scrolling the brightness to the maximum.Hello list, Is there any file that I must edit which sets the default screen brightness to the maximum, so I don't need to change it every time I restart my computer?On Thu, 2012-03-08 at 10:06 +0100, Andras Simon wrote:echo 10 > /sys/class/backlight/acpi_video0/brightnessThere is no such file structure on my Dell laptop Latitude D810. Where you have acpi_videos on a dell you have; dell_backlight. None of the files in that directory do what you are attempting to do.