First of all, I welcome any suggestions of a better forum to post this issue on, but wasn't sure where chipsets would fall. I recently purchased several new ASRock Z690 based boards and also an Asus W680 based board. After installing Windows 11 Pro 22H2 I discovered a common problem with all of them regarding wake timers set by the OS- they are always late. But I don't just mean by a small fixed amount, the delay after the target wake time increases the longer that the system is asleep before the target wake time. For example, if I use Windows Task Scheduler to create a wakeup event 12 hours from now and put the system to sleep, it doesn't wake until 12 hours and roughly 7 minutes have elapsed, with 24 hours asleep being almost 15 minutes late, etc.

 At first I figured it was a BIOS problem and sent a contact form to ASRock support, unfortunately they have not yet responded. Then I purchased the Asus Z680 based board, figuring I could at least get my DVR system working again since it was sometimes now missing 15 minutes of a half hour show since the Z690 'upgrade'. That's when I found that even this board was doing the same thing. I know those two companies are somewhat related, but now I'm not sure the problem is with BIOS. I only recently started a ticket with Asus for this issue.

It's my [limited] understanding that the OS would place a value for the next wake event in the PCH 'Wake Alarm Device Timer' registers sometime before the system goes into S3/S4. Assuming this value is correct, and of course the chipset is functioning properly, then system should wake at the proper time. But since it does not, and the same problem appears from two different manufactures, there must be some common thread.


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I guess I'm hoping that someone with a better understanding than myself of how the OS would interact with the PCH to set this wake timer, and better where specifically to look to find out what's going wrong. I tried to search online to find anyone else experiencing this problem and was surprised to find nothing, considering that I now have 7 boards of three models and two manufacturers all doing the same thing.

I thought of Linux also, but as I recall I found that the rtc wake command actually uses the bios alarm, which seems to be different than this wake alarm in the Intel PCHs used by Windows. In bios, the actual wake time is stored in the registers, and when the RTC matches it the system then wakes up. With this Intel wake alarm register in the PCH though, the time difference until the next wake event is stored in the registers, which then count down until reaching zero, causing the system to wake.

I don't see the same 37 seconds/hour that you observed. I see an approximately 10 minute delay in a 24 hour period. I deduce this based on my Acronis backups waking up the PC at 2am and the creation date of the backup file being 2:10am on the NAS (which is itself awaken by a WOL script). That corresponds to 25 seconds per hour. It does seem to be proportional to the time since last wake, though. I updated the BIOS for both my Z690 and Z790 systems, at a few hours interval. One machine had the next day's backup 10 minutes late, and the the other (which I had updated a bit later) just 8 minutes.

How I arrived at the figure of 37 seconds was as follows: I would create a wake event using Windows task scheduler for some interval in the future, such as 6, 12, 24 hours from (now). I then put the board to sleep and waited for it to wake, getting the actual wake time from Windows event viewer (power troubleshooter). Sometimes something unknown would wake the board up before the target event and I'd have to start over again.

Are you sure your system is actually continuously asleep for the full 24 hours? You can view all the exact sleep and wake times as above- open Event Viewer and select Windows Logs->System in the left pane. Then select 'Filter Current Log' in the right pane and in the box that opens go to the drop down 'Event Source' and select Power-Troubleshooter.

1. Thanks. I see that ACPI Wake Alarm device on both my Z690 and Z790 systems. I don't see it on the AMD X570 system I'm typing this on right now. I wonder if there is a way to forcibly disable the device on the Intel systems and make Windows use an alternative method for the wake timers. Sadly, this can't be done through device manager.

I'm pretty sure I actually tried manually removing that driver once (from outside of Windows) just to see what would happen. As I recall, the system just wouldn't wake for any scheduled events anymore, so another good indication that this ACPI Wake Alarm is indeed the culprit. Would certainly be nice though like you said if there were a way to revert to the previous method they used.

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