This normally happens when movie player or VNC turns it off (you don't
want the screen locking while the movie is playing).
If any of such programs were terminated before they could restore the
regular behaviour, the screen won't lock.
Try using "xset q" to see what the current state is.
Hey there,
On my Thinkpad T490, something is keeping the display awake such
that XScreensaver will not lock the machine, and DPMS will never let
the screen turn off.
There are lots of suspects, with the trackpad, the nipple, and a
Lenovo wireless keyboard attached. However, even after I
