Weird processor frequency issues

From: Kevin Oberman <>
Date: Wed, 13 Oct 2021 16:44:51 -0700
I am seeing very strange CPU frequency issues on my Lenovo L15 with a
CPU: Intel(R) Core(TM) i5-10210U CPU _at_ 1.60GHz (2112.13-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x806ec  Family=0x6  Model=0x8e  Stepping=12


  AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
  AMD Features2=0x121<LAHF,ABM,Prefetch>
  Structured Extended
+  Structured Extended
  TSC: P-state invariant, performance statistics

The system is running with P-States disabled as this s one of the Lenovo
mobile systems that locks up when they are enabled.

The reported frequency of all threads is constant.
> sysctl dev.cpu | grep freq:
dev.cpu.7.freq: 400
dev.cpu.6.freq: 400
dev.cpu.5.freq: 400
dev.cpu.4.freq: 400
dev.cpu.3.freq: 400
dev.cpu.2.freq: 400
dev.cpu.1.freq: 400
dev.cpu.0.freq: 2101

If I do something that runs all 8 threads at near 100% for any length of
time, the core temps will increase to over 90C. I will log:
coretemp0: critical temperature detected, suggest system shutdown
After that is received, the system starts to cool, eventually reaching the
low 40s. All CPUs continue to show near 100% utilization. It will then
repeat the cycle. All continue to show frequencies as above, CPU 0 at 2101
and the remainder at 400.

I have never seen such behavior and am baffled by it. That issue was
reported in 248659
<> and 253288
<> with P-States
seems likely to be related. (BTW, these tickets should be merged as they
are reporting the same problem.)

Would a bug report be appropriate? The P-State issue was reported over a
year ago and is still in the "New" state. It has been widely reported, most
recently a few hours ago.

Kevin Oberman, Part time kid herder and retired Network Engineer
PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
Received on Wed Oct 13 2021 - 23:44:51 UTC

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