For me, I’m starting to think it is related to the level of charge. It has been 3/3 times repeatable for between around 74% and 86% battery charge to have the stuck 0.39Ghz clock. For example, if I plug in to charge at 65%, I have no issue until about 74% and the clock goes back to normal above about 86%. I haven’t had trouble above 95% and at 100%. I haven’t explored charge levels below 50% with this issue in mind yet, so no real data on that.
I attached some cpulogs where I start the log, plug in to charge about a minute later and let it run.
Using:
1135G7 and 21H1
original BIOS 3.02
S0 modern sleep state disabled, so running S03
I tried fast boot on and off, I looked at the USB-C connectors and all 4 shields are good as described in the knowledgebase. I tried moving the charge connector to all 4 locations and both connector orientations with no change. Never had it happen while running only on battery. It can happen with a cool machine that has been shutdown for hours, or a warm one.
Starting at 70% charge and there is no issue:
Starting at 84% and at 86% the issue is gone and the log continues to 91%: