The mode where the EUT has reached an idle condition (e.g. 15 minutes after OS boot or after completing an active workload or after resuming from sleep), the screen has just blanked but remains in the working mode (ACPI G0/S0). Power management features, configured as shipped, should have engaged (e.g. display is on, HDD may have spun-down) but the EUT is prevented from entering sleep mode.