i have a System76 Kudu Pro purchased in 2014. still using it. but i would like to change the color temperature of the display. i looked through the documentation on the system76.com web site but i cannot find anything to adjust the display color temperature. a monitor i had in 2013 (NEC) did have a menu option in the monitor's own setup to adjust color temperature. it had a few specific temperature choices in the menu. i would like to know if there is some way to adjust it, especially on this old model. in case it might be a software accessed feature, i am currently running Xubuntu 18.04.6 LTS last upgraded yesterday. any ideas?