Bug 101241

Summary:	cpufreq ondemand does not work on AMD GX-416RA SOC
Product:	Power Management	Reporter:	Homeros (jakepain)
Component:	cpufreq	Assignee:	cpufreq
Status:	CLOSED INVALID
Severity:	normal	CC:	lenb, rui.zhang, yu.c.chen
Priority:	P1
Hardware:	x86-64
OS:	Linux
Kernel Version:	2.6.32	Subsystem:
Regression:	No	Bisected commit-id:

Description Homeros 2015-07-09 03:26:14 UTC

I want to use cpufreq "ondemand" policy to change the CPU frequency dynamiclly.

But when I insmod the powernow-k8 driver, it detected below data

Jul  9 11:11:43 localhost kernel: powernow-k8: Found 1 AMD GX-416RA SOC                                (4 cpu cores) (version 2.20.00)
Jul  9 11:11:43 localhost kernel: powernow-k8:    0 : pstate 0 (1600 MHz)
Jul  9 11:11:43 localhost kernel: powernow-k8:    1 : pstate 1 (1600 MHz)
Jul  9 11:11:43 localhost kernel: powernow-k8:    2 : pstate 2 (1600 MHz)
Jul  9 11:11:43 localhost kernel: powernow-k8:    3 : pstate 3 (1600 MHz)
Jul  9 11:11:43 localhost kernel: powernow-k8:    4 : pstate 4 (1600 MHz)
Jul  9 11:11:43 localhost kernel: powernow-k8:    5 : pstate 5 (1600 MHz)

Why the CPU frequency is fixed? is it caused by BIOS setting?
Is there some methods to modify the limit in software not BIOS?

Thanks

Comment 1 Chen Yu 2015-11-18 12:33:10 UTC

are you using acpi-cpufreq driver?

plz provide following log with latest  4.4-rc1 if possible

skywalker@sky-lake:/$ grep . /sys/devices/system/cpu/cpu0/cpufreq/*

thank you

Yu

Comment 2 Chen Yu 2015-11-23 10:30:23 UTC

sorry I misread your log, it is related to powernow-k8 driver.. I'm not familiar with it..
How about the result after you
stress -c 4 ?

Comment 3 Chen Yu 2016-08-23 09:34:15 UTC

As we did not get response for quite sometime I'm closing this ticket, please feel free to reopen if you want to continue to debug on this.