Night light and Redshift don't work

Question

I installed Ubuntu on a disk partition just two days ago and everything work like a charm. The only problem I'm having is with the screen temperature color. In Windows I use f.lux and I set the color temperature as red as possible (3500K) all-day-long. I want to do the same in Ubuntu but I faced many issues:

f.lux doesn't change the color at all
Redshift changes the temperature for a couple of seconds, then it suddenly goes back to the normal color
GNOME Night Light has the same problem of Redshift: the change is not permanent although I set the color temperature to be 3500K from 5AM to 3AM

Is anyone having the same problem? How can I fix it?

System info:

Ubuntu 18.04.1 LTS
GNOME 3.28.2
External monitor HP 24" 60,00 Hz

f.lux is buggy and won't work on most 18.04 installation. Other 2 should've worked. — HattinGokbori87, Aug 15 '18 at 07:57
If you want red all day long you don't have to use any of those programs. Just use xrandr at boot time with appropriate gamma settings. — WinEunuuchs2Unix, Sep 27 '19 at 23:27
go to: https://www.computercorrect.com/2018/operating-systems/linux/ubuntu/ubuntu-night-light-tips-tweaks/ there follow the instructions and resetting the settings a bit. Started working for me after i switched it off from the tool, changed the timing settings to default and then turned it on — as3091, Sep 12 '18 at 15:03

score 5 · Answer 1 · answered Mar 05 '19 at 19:33

I found that for Night Light I have to set it to manual mode and set the start time to some time before the current time and the end time sometime before the end time.

I was perplexed for a while because I assumed that, like all other widgets in Ubuntu, setting the switch to on (green) would just turn Night Light on.

score 3 · Answer 2 · edited Sep 26 '19 at 20:00

3

Try un-installing redshift, then use a night light.

I was also having some issues with redshift, couldn't get it to work. So then I tried night light - the colour temperature would flash on for a second and then off again...periodically.

I think there might have been a conflict with redshift, because after I uninstalled it from the command line with

sudo apt-get remove redshift

then the colour temperature on night light seemed to work as expected.

edited Sep 26 '19 at 20:00

BeastOfCaerbannog

14,585

answered Jul 28 '19 at 03:09

edge-case

161

Uninstalling redshift fixed Gnome's Night Light for me and I'm running Gnome on Arch Linux. – ben Sep 07 '19 at 17:52

Night light and Redshift don't work

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