Suspend mode – power light not \blinking any more – Ubuntu 19.04

Up until a few weeks ago, when I entered Suspend mode (pressing power button, selecting it from the power button dropdown or automatic suspension), the power button on my tower would do a slow blink (about 1 per second).

Not sure what happened, but that no longer is the case. Does anyone know why? I have tried editing the grub file to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash mem_sleep_default=deep" or GRUB_CMDLINE_LINUX_DEFAULT="quiet splash mem_sleep_default=shallow" and it doesn’t make a difference.

What would have changed this behaviour? I have not made other changes to this computer and there are not a lot of fine controls of power settings that I have been able to find.