Blank screen

[Şerban S.]

Also check your Menu, Settings, Screensaver & Power Manager, see if there are conflicting settings.

I installed Lite 5.0.
I have trouble disabling the "Blank screen". The settings were inherited from LL 4.8, where everything worked fine.
I checked everything again, but despite the fact that the settings were properly chosen, screen goes blank after some minutes. It's extremely annoying, mostly when I pause doing something, such as: Zoom meetings; viewing a movie; processing long tasks such video formats conversion, video editing - rendering.
System is a Lenovo ThinkPad T400, with the latest BIOS update so nothing else can be tried.
The weird thing though is that trouble only appeared AFTER the upgrade to Lite 5.0!
I could suspect anything went wrong if there was an upgrade over a previous version.
Since it's a new series, nothing like that applies. I've made a clean installation.
More than that, I've been using Lite for over two years, on a daily basis, for all my work, starting with 4.2 and everything was fine, until now.
Tried to use DConf, but all the settings are available from the graphical front-end "Settings". Nothing to suggest that might be a hidden setting.
My question is:
How can I get rid of the "blank screen" App? Or what causes the screen go blank?
Is there any workaround?
My DE is XFCE. The XFCE version, is the one shipped with the distro's ISO.
Everything else works flawlessly, except for that.
Is it Ubuntu Core related? And if so, is there anything that can be done?
Thanks for all the grat work with Lite!
All the best!
Şerban.