[Bug 242166] cpufreq can't be loaded on old cpus and some new (such with LGA775) without hint.p4tcc.0.disabled=0

[bugzilla-noreply at freebsd.org]

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: bugs at FreeBSD.org
          Reporter: sasamotikomi at gmail.com

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.

-- 
You are receiving this mail because:
You are the assignee for the bug.