https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249889
Bug ID: 249889
Summary: [cpufreq] does not seem to fully support AMD Ryzen 9
4900H
Product: Base System
Version: CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 218282
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218282&action=edit
dmesg output
Hello everyone,
It would seems that FreeBSD cpufreq driver does not yet fully support AMD Ryzen
9 4900H processor.
When doing a sysctl dev.cpu.0 on a FreeBSD current at svn revision r366130 it
shows :
root@laptop:~ # sysctl dev.cpu.0
dev.cpu.0.temperature: 51.0C
dev.cpu.0.cx_method: C1/hlt C2/io C3/io
dev.cpu.0.cx_usage_counters: 17638 0 929634
dev.cpu.0.cx_usage: 1.86% 0.00% 98.13% last 7510us
dev.cpu.0.cx_lowest: C8
dev.cpu.0.cx_supported: C1/1/1 C2/2/400 C3/3/350
dev.cpu.0.freq_levels: 3300/4021 1700/1615 1400/1277
dev.cpu.0.freq: 1400
dev.cpu.0.%parent: acpi0
dev.cpu.0.%pnpinfo: _HID=ACPI0007 _UID=1 _CID=none
dev.cpu.0.%location: handle=\_SB_.PLTF.P000
dev.cpu.0.%driver: cpu
dev.cpu.0.%desc: ACPI CPU
root@laptop:~ #
You can see that the cpu can go from 1400 Mhz to 3300 Mhz but it is supposed to
be capable to boost to 4400 Mhz (AMD specifications can be found here :
https://www.amd.com/en/products/apu/amd-ryzen-9-4900h).
during the boot I can see that cpufreq detects something :
hwpstate0: <Cool`n'Quiet 2.0> on cpu0
Is turbo mode implemented for Ryzen Zen 2 3rd gen CPUs ?
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