https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242166
Bug ID: 242166
Summary: cpufreq can't be loaded on old cpus and some new (such
with LGA775) without hint.p4tcc.0.disabled=0
Product: Base System
Version: 12.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Only with hint.p4tcc.0.disabled=0 in loader.conf frequency can be loaded and
changed on celeron 430.
Sysctl output with hint.p4tcc.0.disabled=0 in loader.conf
$ sysctl dev.cpu.0.freq_levels
dev.cpu.0.freq_levels: 1814/-1 1587/-1 1360/-1 1133/-1 907/-1 680/-1 453/-1
226/-1
Probably as well almost on all without C-state or not supported with C-state
CPU by FreeBSD from 2000-2010.
P4TCC obviously haven't support voltage changing, so we need more modern
replacement or at least enable p4tcc by default on not supported CPU as
temporarily solution.
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