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Recently I've started coming back to find my CentOS 7 (running GNOME) laptop's screen fully lit and unlocked, even though I haven't done anything on it for [many many] hours (previously it would lock after <some reasonable time>). There's a little alert dialog in in the upper right corner that says "an application has prevented the <something or other about screen saver/lock happening>" without any detail as to what application is responsible.

How can I determine which application is preventing screen locking?

Potentially relevant portion of xset q output:

Screen Saver:
  prefer blanking:  yes    
  allow exposures:  yes
  timeout:  0    
  cycle:  0
Colors:
  default colormap:  0x5a    
  BlackPixel:  0x0    
  WhitePixel:  0xffffff
Font Path:
  catalogue:/etc/X11/fontpath.d,built-ins
DPMS (Energy Star):
  Standby: 0    
  Suspend: 0    
  Off: 0
  DPMS is Enabled
  Monitor is On

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