[Bug 253288] hwpstate_intel: Wedges under any kind of load on ThinkPad Carbon X1 Gen 8

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253288

            Bug ID: 253288
           Summary: hwpstate_intel: Wedges under any kind of load on
                    ThinkPad Carbon X1 Gen 8
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: ltning-freebsd at anduin.net

Only workaround is to add
 hint.hwpstate_intel.0.disabled=1
to /boot/loader.conf, but this makes power consumption go through the roof and
generates a lot of dmesg warnings about overheating, suggesting the computer be
switched off.

BIOS powersaving settings have no bearing on this problem.
The problem has existed since early 2020, and got significantly worse in the
Jan/Feb timeframe. However sporadic hangs with kernels from late 2019 have also
been observed.

Kernel/world version stable/13 106efdb060ae523a88caf5ddc3516500cf5b1d64

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