Enable CPU Throttling/Scaling

[juanfgs]

Hello, since Fedora 16 I'm having issues enabling CPU Scaling for my processor:

processor : 0

vendor_id       : AuthenticAMD
cpu family      : 16
model           : 4
model name      : AMD Phenom(tm) II X2 560 Processor
stepping        : 3
microcode       : 0x10000c8
cpu MHz         : 1657.488
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt npt lbrv svm_lock nrip_save
bogomips        : 3314.97
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate
processor       : 1
vendor_id       : AuthenticAMD

this is the output of lspci

00:00.0 RAM memory: nVidia Corporation MCP61 Memory Controller (rev a1)
00:01.0 ISA bridge: nVidia Corporation MCP61 LPC Bridge (rev a2)
00:01.1 SMBus: nVidia Corporation MCP61 SMBus (rev a2)
00:01.2 RAM memory: nVidia Corporation MCP61 Memory Controller (rev a2)
00:02.0 USB Controller: nVidia Corporation MCP61 USB Controller (rev a3)
00:02.1 USB Controller: nVidia Corporation MCP61 USB Controller (rev a3)
00:04.0 PCI bridge: nVidia Corporation MCP61 PCI bridge (rev a1)
00:05.0 Audio device: nVidia Corporation MCP61 High Definition Audio (rev a2)
00:06.0 IDE interface: nVidia Corporation MCP61 IDE (rev a2)
00:07.0 Bridge: nVidia Corporation MCP61 Ethernet (rev a2)
00:08.0 IDE interface: nVidia Corporation MCP61 SATA Controller (rev a2)
00:08.1 IDE interface: nVidia Corporation MCP61 SATA Controller (rev a2)
00:09.0 PCI bridge: nVidia Corporation MCP61 PCI Express bridge (rev a2)
00:0b.0 PCI bridge: nVidia Corporation MCP61 PCI Express bridge (rev a2)
00:0c.0 PCI bridge: nVidia Corporation MCP61 PCI Express bridge (rev a2)
00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor HyperTransport Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Miscellaneous Control
00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Link Control
02:00.0 VGA compatible controller: nVidia Corporation Device 1040 (rev a1)
02:00.1 Audio device: nVidia Corporation HDMI Audio stub (rev a1)

I've tried modprobing acpi-cpufreq, powernowk8 and other modules but it doesn't seem to work and CPU is running at max frequency all the time. Any idea?

[marko]

That's a 3.3GHz processor (max speed), and your cpuinfo shows it's at 1.657GHz.
Why do you think it's running at maximum all the time? It looks to me like it's scaling back to 1.657GHz from 3.3 correctly

[george_toolan]

Because he looked at the bogomips ;-)

[juanfgs]

No, both cores run at 1650 MHz max (that's relative since is a chip intended to be overclocked) I can confirm that Throttling is NOT working, but it seems that powernow-k8 complains at boot and tells me to update the BIOS in order to work

[george_toolan]

You do realize that throttling means "going slower", don't you? Anyways

What kind of motherboard do you have? Did you install the latest BIOS update?

Are there any BIOS settings which could affect this problem?

Which kernel are you using?

Have you tried Fedora 17 LiveCD?

Have you tried some boot parameter which could solve this problem?

Here's a list ftp://ftp.uni-kl.de/pub/linux/knoppi...cheatcodes.txt

Please note that knoppix is a different Linux distribution, but most kernel parameters should be working with Fedora as well.

[juanfgs]

Originally Posted by george_toolan

You do realize that throttling means "going slower", don't you? Anyways

Yes, I wanted the frequency to be scaled on demand as it was before.