Dimm my screen light from software while keeping night light

n0tis

10/30/23, 9:47 PM

I like night light (build-in setting in my ubuntu 20.04), but it doesn't reduce screen brightess enough.

Is there a command / tool I could use to dimm my screen further, while keeping the night light orage tint ?

123

1 + 2

brightness

screen

night-light

guiverc

10/30/23, 10:27 PM

I don't just use a single desktop, thus use `redshift` (*or GUI front-ends like `redshift-gtk`) so I have the same settings for whatever desktop I decide to login with, but it allows me to set values for day & night, and not just when redshift is fully operating (ie. *night* mode like your existing program). I've not fully explored night light as it's GNOME specific.

n0tis

10/31/23, 9:30 PM

`redshift -P -O <colorTemps> -b <brightness> `works well, thanks !

Score:0

Ubuntu

Caasi

10/30/23, 10:42 PM

My approach would be changing the brightness from the terminal using the built in xrandr command and a cron job say at 6pm to reduce the brightness and 7am to increase it.

Type xrandr | grep " connected" | cut -f1 -d " " in terminal to fetch the name of the attached display to your Ubuntu system. Then use this command format, xrandr --output [display-name] --brightness [level of illumination] to set the preferred levels eg. xrandr --output VGA-1 --brightness 0.5. It might be easier to create two different shell scripts for this - one for day & the other for night.

UPDATE

You can turn the night light on in the same scripts in-case adjusting your brightness turns off the night light using gsettings - https://askubuntu.com/questions/1246195/how-to-turn-on-night-light-blue-light-filter-in-ubuntu-20-04

+ 3

n0tis

10/31/23, 9:24 PM

thanks, but on my ubutnu 20.04 unfortunately this approach remove the "night light" orange tint

Caasi

11/1/23, 6:10 AM

I didn't think that would happen. I have updated the answer - seems you can also turn it on using the terminal

n0tis

11/3/23, 8:05 AM

Thanks, but turning on gnome night light seems to turn off screen dimmer and vice versa. I installed redshift and it works well :)

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