Chromebook Screen Dimming Tip
I was looking for an alternative to f.lux / screen filter (android) / shades (mac) to keep the screen more dim at night, and couldn't find one that I liked. A lot of them would just dim the webpage and not the whole system. However, on linux there's a trick you can do to write the brightness value directly from the terminal, and I wondered if the same trick would work on chromeos.
With developer mode on, from crosh (ctrl+alt+T):
shell sudo su cd $(dirname $(find /sys -name brightness))
This will bring you to a directory with brightness information. On my Samsung chromebook this was
From here, you can use the following commands to check the max brightness, current brightness, and then set your own.
This will display the current brightness value:
This will display the maximum brightness value:
This will set the brightness value to whatever number you put there (in this case, 7):
echo 7 > brightness
My chromebook, using just the buttons would allow me to go as low as 18, and so using this trick I was able to make it 1/3 as the dimmest settings the buttons would go!
This may have gotten a little technical, but it isn't using crouton or any other linux things, just out of the box developer mode. I was very impressed to see this linux trick still work on chromeos.