Whenever i press any button to wake my system from suspend it screen get on with grey background and mouse poniter then w/o showing the login screen goes blank..

After that no matter what i do the screen doesn't show..

If i enter the password then everything goes back to normal..

This does't happen when i lock the screen.. In lock screen when i press the button i get the login screen but in suspend it gets blank..

This didn't happen in any other linux distro.. Please help..

I found a discussion of this issue in the Xubuntu support email list, archived here. Unfortunately the suggestion is a rather wonky workaround that requires a GNOME reversion:

Installing gnome-screensaver (which required no dependencies) and unchecking light locker from startup applications.

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