Moving from linux kernel 5.4 to 5.10 causes my screen never to show display again once it has gone to sleep.

As one can see in this video, I can call xflock4 which locks the screen and I'm able to go back when the screen goes to I think screensaver mode.

But doing it while waiting only a few seconds later as the screen goes into sleep mode, I can no longer bring it back. It's stuck at 'screen saver' mode and does not respond to any input.

This happens in Linux 5.10, but not in Linux 5.4.

What should I do?
Report this here?
https://www.kernel.org/doc/html/late...ng-issues.html

Move to kernel 5.13 and hope for the best?