I cannot reasonably tell you if it is a regression, because my usage rarely
gets
my monitor in dpms off mode. That on top of the fact I did a new custom
gnu/linux distro recently.
If you have some compilation or not flags to enable tracing of video mode
related code (in any/all components), I'll give it a shot.

I must say that the keyboard and mouse are responsive and I can use the
computer
blindely when the monitor is looping in trying to restore the video mode, thus
I am able to get on the spot logs.