(This probably belonged on debian-user, but since I have background on this specific problem and already did the research.)
Raj Kiran Grandhi <grajki...@gmail.com> writes: > In a fresh install of Buster with XFCE desktop, locking the screen > blanks the monitor and the monitor enters a power save state. After > that, neither moving the mouse nor typing on the keyboard would turn > the monitor back on. Ctrl-Alt-F7 will also restore the desktop (which I think is just another version of your solution 2 of switching VTs). This appears to be a bug in light-locker specifically, which is the default screen lock program with XFCE with lightdm. See, for instance: https://github.com/the-cavalry/light-locker/issues/114 Switching to another greeter from the default gtk-greeter appears to help according to that bug, which may mean that the bug is actually in lightdm-gtk-greeter. There doesn't appear to be a Debian bug for this; it might be a good idea to open one against light-locker (or, if you confirm switching to slick-greeter per that bug, lightdm-gtk-greeter). -- Russ Allbery (r...@debian.org) <http://www.eyrie.org/~eagle/>