My PC wakes itself roughly 50–60 minutes after I put it into sleep mode. The fans and case lights turn on, but the monitor stays off. Event Viewer reports that the system initially resumed a few seconds after entering sleep, then later woke again with the wake source listed as unknown.
I've already replaced the motherboard, CPU, and power supply; removed the graphics card, case, SSDs, monitor, and all peripherals; tried clean Windows installations on different drives; tested another outlet; toggled ErP; checked PCIe generations and forced them to Gen 3; and disabled wake permissions for the network adapter and USB devices. The PC still wakes even with no USB devices connected. Is there anything else I can check to identify what is causing this?
1 Answer
You can use PowerShell as administrator with powercfg to disable wake permissions for every device, then re-enable only the keyboard and mouse. The useful checks are powercfg /devicequery wake_armed, powercfg /lastwake, and powercfg /waketimers. Since you’re already seeing no devices listed as wake-armed, the script may not change much in your case, but those commands can confirm whether a device or scheduled timer is involved.
I already disabled every wake-capable device, and powercfg -devicequery wake_armed reports NONE. I also removed all USB devices, but the PC still woke up. The keyboard is the only device I’ve re-enabled, so I’m not sure the script would do anything beyond that.