Screen Brightness Setting in Ubuntu

Sometimes in Ubuntu, screen brightness reset to the lowest or highest on every boot. It’s inconvenient to configure the screen brightness on every login.

Here are some steps that one should follow to save the brightness settings.

step 1:Set the brightness of your choice that you want to have on every startup.
         

step 2: Open /etc/rc.local file in terminal window using editor.
            
           sudo nano /etc/rc.local

           I am using nano text editor, you can use gedit or any other editor.

step 3: Now add these two lines in rc.local file
           
           echo X > /sys/class/backlight/intel_backlight/brightness

           echo Y >  /sys/class/backlight/acpi_video0/brightness
          
           X and Y are actually values of brightness level

           The values of X and Y can be found as follows:
          
            - To get the value of X
            - go to /sys/class/backlight/intel_backlight folder
            - open 'brightness' file.
            - It will contain the some numeric value. This value is value of X.

            - Similarly to get the value of Y
            - go to /sys/class/backlight/acpi_video0 folder
            - open 'brightness' file.
            - It will contain the some numeric value. This value is value of Y

 Finally your rc.local file will look like:

Note here my value of X = 260 and Y=28.