It doesn't kill the process after I logout.

[laichiaheng]

It doesn't kill the process after I logout, so everytime I login, it creates a new process, because I set it as autostart.

[AloisCRR]

I solved it by auto-starting a bash script

killall -q redshift
# Wait for process to shut down
while pgrep -u $UID -x redshift >/dev/null; do sleep 1; done
redshift &

Edit: You should disable the service on systemd, in my case was systemctl --user disable redshift.service