Open bug in launchpad.net
"If the machine goes to sleep, either because I close the lid or because it idles too long, it ends up in a weird state when I try to resume. If I press the power/Alien button, the fan runs and the keyboard/trackpad light up but nothing happens.
Ultimately I need to hard power off the laptop (by holding the power button in for three seconds) which causes it to boot from scratch."
Cristian Aravena Romero (caravena)
Fixed in 4.19-rc7.