Why are screens dimmed incrementally then enlightend back to initial brightness?

[joyofdata]

Hello!

I'm working on Linux Mint 17.3 and installed the most recent redshift version:

sudo add-apt-repository ppa:dobey/redshift-daily
sudo apt-get update
sudo apt-get install redshift
sudo apt-get install redshift-gtk
redshift -V
# redshift 1.11

Now I run the command suggested on http://jonls.dk/redshift/:

redshift -l 53.5:10 -t 5400:3600 -g 0.8 -m randr -v

(I only adjusted the lon lat for Hamburg, Germany)

Now this happens:

Location: 53.50 N, 10.00 E
Temperatures: 5400K at day, 3600K at night
Solar elevations: day above 3.0, night below -6.0
Brightness: 1.00:1.00
Gamma (Daytime): 0.800, 0.800, 0.800
Gamma (Night): 0.800, 0.800, 0.800
Status: Enabled
Period: Daytime
Color temperature: 6489K
Brightness: 1.00
Color temperature: 6478K
Color temperature: 6467K
Color temperature: 6456K
[...]
Color temperature: 5432K
Color temperature: 5422K
Color temperature: 5411K
Color temperature: 5400K

The screen dims down parallel to the printed color temperatures. At 5400K it stops and the screens start blinking - seemingly switching in 2sec intervals between 5400K and the initial color temperature.

After a while I press [Ctrl]+C it prints this while lightening up to initial color temp:

Color temperature: 5510K
Color temperature: 5565K
Color temperature: 5620K
Color temperature: 5675K
[...]
Color temperature: 6390K
Color temperature: 6445K

Obviously I would like the screens to just stay at 5400K.

If I just command redshift -O 4500 it prints Using method 'randr'., dims the color temperature and switches back to initial bright color temp after about 3 seconds.

What am I doing wrong?

[jonls]

You most likely have some other software running that is also updating the display gamma ramps. This could be a separate instance of Redshift or it could be another program (https://github.com/jonls/redshift#faq)