Greeter doesn't appear after resume from suspend or hibernate

## What Happened

My laptop is configured to suspend when the lid is closed. But after opening the lid to resume the system, the greeter never appears.

Same issue happens if I disable any "lid close" actions in System Settings and instead use *acpid(8)* to _hibernate_ after closing the lid: greeter is not visible upon resume, but sounds are audible.

I'm quite sure this is _not_ a dupe of #165. The login prompt _never_ becomes visible, even after waiting many hours.

## Expected Behavior

I expect to always see login prompt after resuming from suspend or hibernation.

## Steps to Reproduce

1. Open System Settings, configure to suspend when laptop lid is closed
2. Close laptop lid, allow system to enter sleep, re-open laptop lid

Obviously, many people are able to perform these steps every day without issue, so this is probably due to some quirk in my hardware.

### Logs

Nothing interesting in systemd journal or Xorg logs, just normal suspend/resume spew. Absolutely no indication that there is anything wrong with display hardware

## Platform Information

Elementary OS 5.1.7 Hera
Fully up-to-date

Laptop is a 1st-generation (2016) Razer Blade Stealth with an i7-6500 and Intel HD Graphics 520