Artificially increase maximum screen brightness

16.04 display laptop brightness

7,732

Run this to see a list of your outputs. You're looking for the one that is "connected":

xrandr --current

Here's a screenshot of my list. The output I want is the "connected" eDP1 at the top:

Now you can run these commands to make adjustments. Replace eDP1 with the name of your output, and change 1.2 to make the adjustments:

xrandr --output eDP1 --brightness 1.2
# Note: 1 is default

You can also use gamma instead of brightness:

xrandr --output <outputname> --gamma 0.5:1.0:1.0
# Note: 1.0:1.0:1.0 is default

7,732

oshirowanen

Updated on September 18, 2022

Comments

oshirowanen over 1 year

I have my laptop set to maximum brightness, but it's not bright enough. Is it possible to somehow make it brighter?
- GreggD almost 8 years
  
  Check this topic, maybe it will help: askubuntu.com/questions/62249/…
- Jacob Vlijm almost 8 years
  
  not sure if this helps, but xrandr --output <screen_name> --brightness 1.1 does that, but the screen usually looks ugly then. Retrieve <screen_name> from the output of xrandr.
Mark Kirby almost 8 years

You should not add other information in the middle of your code, it breaks the code and when people copy it, it simply won't work. I have edited it but be careful not to break your code.
Hizqeel almost 8 years

@MarkKirby Thanks for pointing out that mistake. I will make sure not to do that again.
oshirowanen almost 8 years

@Hizqeel, I get the following: userone@laptop:~$ xrandr --output DVI-0 --brightness 2 warning: output DVI-0 not found; ignoring xrandr: Need crtc to set gamma on. userone@laptop:~$
Jacob Vlijm almost 8 years

@oshirowanen you obviously didn't read the comment to your question. DVI-0 is not the name of your screen.
Hizqeel almost 8 years

@oshirowanen I have updated the answer. If this is clear and solves your problem then let me know.
oshirowanen almost 8 years

Thanks, how do I figure out what the default value was? 2 is way to bright and makes the text look bad. Currently have set it to 1.
Jacob Vlijm almost 8 years

@oshirowanen 1 is the default, I would try 1.1 for a start.
Abe Petrillo over 6 years

This was very helpful thankyou. Is there any software available that would make it easier to try different settings?
Philippe Delteil over 6 years

In my case (using Ubuntu 17.10) the commands didn't make any change.