[Bug 238838] HP X3421 could not turbo boost to 3.4GHz

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238838

            Bug ID: 238838
           Summary: HP X3421 could not turbo boost to 3.4GHz
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: paul.lkw at gmail.com

HP X3421 (based on AMD 64 bits X3421 GPU) could not turbo boost to 3.4GHz
It could only running at Max. speed of 2.1GHz only.

Repeation:
1. Install the basic system
2. Enable the CPU frequency control feature (enabled by default), device
cpufreq
3. enable Powerd in /etc/rc.conf, powerd_enable="YES"
4. make full load to the system
5. observe the sysctl variable by "sysctl -a | grep cpu.0.freq"

it will show;
dev.cpu.0.freq_levels: 2100/5036 1800/3650 1400/2428
dev.cpu.0.freq: 2100

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