I also confirm it doesn't work with 18.04.01 32bits, gnome 3.28.2: caffeine and caffeine indicator are in processes list caffeine indicator button is not visible xscreensaver is not disabled when playing full screen video (firefox or VLC)
I also confirm it doesn't work with 18.04.01 32bits, gnome 3.28.2:
caffeine and caffeine indicator are in processes list
caffeine indicator button is not visible
xscreensaver is not disabled when playing full screen video (firefox or VLC)