I am among the 3 people in this thread who are experiencing the 'System' process using one CPU thread at 100% utilization indefinitely. It starts with a seemingly random delay - between 10-300 minutes after powering on the machine, but the process will never end. I've let it run for 3.5 days several times. We've independently identified the problem thread within the 'System' process as ntoskrnl.exe!KeInitializeApc+0x4c0 . We are using Dell Precision 5540, XPS 9520, and  XPS 9500.

Is anyone else experiencing this problem? Might anybody have experience maybe diagnosing XPERF traces? I've reinstalled Windows 11 twice and rolled back all feature and quality updates. The problem always returns. I would appreciate the community's help in this regard.