Cannot limit to one randr output about redshift HOT 3 CLOSED

Both of your monitors are probably in the same X screen (that is usally the case provided that they are attached to the same graphics card). Vidmode can only control the primary monitor in each screen. By using RandR instead you can select any monitor in any screen.

[redshift]
adjustment-method=randr
[randr]
screen=0
crtc=1
; selects the secondary (crtc=1) monitor in the first screen (screen=0).

from redshift.

I think this is the same issue as #23 which probably shouldn't have been closed. In randr there is the concept of screens and outputs and at the moment Redshift can only affect whole screens individually. What I think you really want is to affect each output individually. You can run xrandr for a list of screens and outputs.

from redshift.

This should be working now with the crtc=... option in the randr gamma adjustment method.

from redshift.