[Bug 248659] Specific generations of intel chips lock up with P-states active

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248659

--- Comment #20 from Sergei Masharov <serzh at expir.org> ---
Also I have noticed these differences:

With hint.hwpstate_intel.0.disabled="1" sysctl dev.cpu.0 looks exactly the same
as 12.2-RELEASE and all releases before:

# sysctl dev.cpu.0
dev.cpu.0.cx_method: C1/mwait/hwc C2/mwait/hwc C3/mwait/hwc
dev.cpu.0.cx_usage_counters: 1151952 0 0
dev.cpu.0.cx_usage: 100.00% 0.00% 0.00% last 15982us
dev.cpu.0.cx_lowest: C1
dev.cpu.0.cx_supported: C1/1/1 C2/2/151 C3/3/1034
dev.cpu.0.freq_levels: 2101/15000 2100/15000 1900/13193 1800/12317 1700/11459
1600/10759 1500/9936 1400/9127 1200/7696 1100/6937 1000/6196 800/4888 700/4193
600/3514 500/2850 400/2325
dev.cpu.0.freq: 2101
dev.cpu.0.%parent: acpi0
dev.cpu.0.%pnpinfo: _HID=none _UID=0 _CID=none
dev.cpu.0.%location: handle=\_SB_.PR00
dev.cpu.0.%driver: cpu
dev.cpu.0.%desc: ACPI CPU

but without this option it is completely different:

# sysctl dev.cpu.0
dev.cpu.0.cx_method: C1/mwait/hwc C2/mwait/hwc C3/mwait/hwc
dev.cpu.0.cx_usage_counters: 5944 0 0
dev.cpu.0.cx_usage: 100.00% 0.00% 0.00% last 10276us
dev.cpu.0.cx_lowest: C1
dev.cpu.0.cx_supported: C1/1/1 C2/2/151 C3/3/1034
dev.cpu.0.freq_levels: 2112/-1
dev.cpu.0.freq: 1005
dev.cpu.0.%parent: acpi0
dev.cpu.0.%pnpinfo: _HID=none _UID=0 _CID=none
dev.cpu.0.%location: handle=\_SB_.PR00
dev.cpu.0.%driver: cpu
dev.cpu.0.%desc: ACPI CPU

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