Created attachment 142277 [details]
Picture showing no effects in log-in screen when resuming from suspend

SUMMARY
No Blur and rounded avatar in log-in screen when resumed from suspend. Only occurs with a NVIDIA GPU.

STEPS TO REPRODUCE
1. Sleep the computer.
2. Resume from suspend.
3. The log-in screen doesnt have blurring or rounded avatar effects.

OBSERVED RESULT
  When you follow the above steps, you would see that there is no blurring or rounded avatar when the log-in screen appears after resuming from suspend (as shown in the attachment picture). This doesnt occur when logging in after locking the system but only after suspend.
  I have also tested this in a NVIDIA Prime setup using my integrated GPU for desktop rendering and the log-in screen, after resuming, had no issues. I have tested this with Plasma 5.22.5 and 5.22.90 and both have this issue.

EXPECTED RESULT
  When resuming from suspend, the log-in screen should function the same way it functions when logging in after locking and show the effects properly with NVIDIA GPU and proprietary NVIDIA drivers.

SOFTWARE/OS VERSIONS

OS: Arch Linux (up-to date and using kde-unstable repository)
Linux Kernel: Linux-Zen-5.14.9 & Linux-TKG-5.14.9-204-tkg-pds (Kernel doest make any difference)
KDE Plasma Version: 5.22.90
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
NVIDIA GeForce GTX 1060 6GB
NVIDIA Proprietary Driver Version: 470.74