Fix ERROR_TIMER_RESUME_IGNORED (0x000002D2) in Windows

Quick answer: Update your chipset and power management drivers, then disable Fast Startup. The culprit is almost always a driver that doesn't handle power state transitions properly.

This error — ERROR_TIMER_RESUME_IGNORED with code 0x000002D2 — shows up when an application calls SetWaitableTimerEx with the WT_EXECUTEONLYONCE flag, and the system decides to ignore the resume request. I've seen this most often in custom monitoring software, backup tools, or video recording apps that wake the system from sleep. Windows just shrugs and says “nope.” Why? Because a driver or power policy is blocking the timer from triggering a resume. It's not a critical system crash, but it'll break scheduled tasks and automation.

Step-by-Step Fix

1. Update chipset and power management drivers. The single biggest cause is an older Intel Management Engine Interface (MEI) or AMD chipset driver. Go to your motherboard or laptop manufacturer's support page — not Windows Update. Grab the latest chipset driver, install, reboot.
2. Disable Fast Startup. This Windows feature is a known troublemaker for timer APIs. Open Control Panel, go to Power Options → Choose what the power buttons do → Change settings that are currently unavailable. Uncheck Turn on fast startup. Reboot.
3. Check for conflicting scheduled tasks. Open Task Scheduler, look for tasks set to “Wake the computer to run this task.” If you see tasks from third-party software (antivirus, backup tools), disable them temporarily. The Windows system tasks rarely cause this.
4. Use powercfg to audit wake timers. Open an admin command prompt and run:

   powercfg /waketimers

   This lists all timers that can wake the system. If you see a yellow warning or repeated failures, note the process name. That's your suspect.
5. Update or roll back the suspect driver. If the powercfg output points to a specific driver, go to Device Manager, right-click that device, select Properties → Driver → Update Driver. If the problem started after a recent update, roll back instead.

Alternative Fixes (if the main steps don't work)

• Repair the System Power State. Run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth in an admin command prompt. Corrupted system files can mess with power transitions.
• Check for third-party power management software. Apps like ASUS AI Suite, MSI Dragon Center, or Lenovo Vantage often inject their own power policies. Disable or uninstall them temporarily to see if the error stops.
• Reset the power plan. Run powercfg -restoredefaultschemes in an admin prompt. Then set your plan back to Balanced. Custom plans sometimes break timer behavior.

Prevention Tips

• Keep chipset drivers updated manually. Don't rely on Windows Update for these — it's often months behind.
• Avoid Fast Startup. I disable it on every system I touch. The boot speed gain is marginal on SSDs, and the stability cost isn't worth it.
• Test timer-based apps after driver updates. If you use any software that wakes the system, run it manually after a driver change to catch regressions early.

If you've done all this and still see 0x000002D2, you're probably dealing with a kernel-level bug in a driver you can't easily replace. In that case, contact the device manufacturer's support and reference the exact error code — they'll know what it means.