Nothing new here, but if you have a newer CPU generation (11th gen+) then it should not be affected. Or you can disable HVCI anytime.
Core Isolation was disabled on my PC and I still had the issue. Current Win11 build is 22621.382 (22H2).I have done some more testing, so here the results:
- This issue affects 10th Generation (Comet Lake) and earlier CPUs. 11th generation CPUs (Ice Lake, Rocket Lake) support an alternate way to read BCLK and that seems to work properly.
- The culprit is the Core Isolation feature - when enabled (which is the default setting in Windows 11), it will block a certain interface that needs to be used on 10th generation and earlier CPUs.
So my advice is to disable the "Core Isolation" feature if you you're affected by this and need to see correct BCLK