[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 #28 from Sergei Masharov <serzh at expir.org> ---
I have updated couple more systems to RC5 and none of them have such strange
dev.cpu.0.freq_levels

As I have mentioned before, on the problematic Lenovo system it looks like 
dev.cpu.0.freq_levels: 2112/-1

if I try to change the dev.cpu.0.freq it looks even more strange:
root at lenovo:/etc # sysctl dev.cpu.0.freq=99999
dev.cpu.0.freq: 1005 -> 936
root at lenovo:/etc # sysctl dev.cpu.0.freq=2112
dev.cpu.0.freq: 1005 -> 1005
root at lenovo:/etc # sysctl dev.cpu.0.freq=2112
dev.cpu.0.freq: 1005 -> 4222
root at lenovo:/etc # sysctl dev.cpu.0.freq=2112
dev.cpu.0.freq: 1005 -> 3911
root at lenovo:/etc # sysctl dev.cpu.0.freq=2112
dev.cpu.0.freq: 1005 -> 4222


Is it a normal and expected behavior? Because with
hint.hwpstate_intel.0.disabled="1" it looks like on any other system and on the
versions before 13.0

If the system is idle it can work up to several hours now, but on any
significant CPU load it freezes just several minutes after.

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