I have tried to install Gammastep using this command that is supposed to be for Solus:
$ sudo eopkg install gammastep
This came back with a few lines that each said success. Did not show any problems.
When I searched the menu I found "Run Gammastep". When I ckicked on that I got the same results as with Redshift. Mouse curser changes to icon and icon shows up on the task bar. Then both disappear after a few seconds and normal mouse curser comes back.
Trying again in Konsole I got this:
carrollb@carroll-solus ~ $ gammastep
Error: Could not control gamma, exiting.
Error: Failed to start adjustment method: wayland
So it looks like Gammastep also doesn't like Wayland or vice versa.