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I was facing the problem of the night light not working on my laptop since I installed Ubuntu 20.04 but it gets resolved as soon as I restart my system. But now, when I started my system, the night light is working on the laptop screen but not on the joined display monitor, which was working fine since the time I am using joined displays which is more than 3 years.

Also, many people are facing this nightlight problem on their Ubuntu 20.04 and the only solution people are offering is rebooting the system, which solves the problem in many cases But rebooting the system every time I open it doesn't seem like a feasible solution. So is there any permanent solution to this problem?

Dhruv Sharma
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  • You mention night light (which is part of GNOME), but also mention RedShift (a different program). They can fight or interfere with each other and you get problems if you use two such programs that do the same thing. If you're using redshift as well as GNOME's night light; I'd suggest using just one. Me I disabled GNOME's night light and just use redshift, as I have other desktops installed, and redshift works in all of them – guiverc Nov 24 '20 at 07:43
  • @guiverc Thanks for your reply. Okay yes, I am only using night light. So you are suggesting that I should ask this question in the GNOME community right? I will do that surely. thanks. – Dhruv Sharma Nov 24 '20 at 07:45
  • No, I was just talking from my experience of running two programs (GNOME's night light & redshift) at the same time. They can interfere with each other & the result isn't great. As you mentioned the two programs I've used together, I was suggesting just using GNOME's night light alone, or redshift (with night light disabled). GNOME's Night light & redshift are different programs that do almost the same thing. If you're using only one, I'd suggest correcting your question (you can edit your own questions) as it leads to my obvious response – guiverc Nov 24 '20 at 07:48
  • It happened to me too. I have it set to manual timing, from 05:00 to 04:59. When it broke, even the nightlight icon did not show up in the panel. But I noticed that my monitors (laptop + external HDMI) have disappeared from the Settings app's Color settings sidebar item. I set the preinstalled D50 color profile for my laptop's screen on that Color settings UI. But now only my printer had shown up to set a color profile to: the monitors did not. I think it's related. A reboot however restored everything: the Color settings UI, the laptop screen color profile, and night light. – Levente Feb 28 '21 at 02:03

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