HOWTO: CPU Frequency Scaling w/ Kernel Module

[pixelboy]

Hey guys..

IS this how-to the best way to get my AMD X2 4600+ up to speed on my EDGY AMD64 install?

She's running at half pace

processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 75
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4600+
stepping : 2
cpu MHz : 1000.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 1
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 lm 3dnowext 3dnow up pni cx16 lahf_lm cmp_legacy svm cr8_legacy
bogomips : 2011.80
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc

processor : 1
vendor_id : AuthenticAMD
cpu family : 15
model : 75
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4600+
stepping : 2
cpu MHz : 1000.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 1
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 lm 3dnowext 3dnow up pni cx16 lahf_lm cmp_legacy svm cr8_legacy
bogomips : 2011.80
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc

[Lomz]

Hi

thanks for a wonderfull howto, mi problem is that when I restart the computer it seems like it somehow doest remember this settings, and I need to run all the commands again.
And I am not using a live cd...

Anybody has an idea about how to solve this?

Nobody knows?

[cb474]

If I use this method for frequency scaling, instead of the default use of powernowd, is there a way to automatically have different settings when on ac and when on battery? I want to use ondemand for ac and conservative for battery.

Also, does this method mean that the settings in the Power Management Preferences window no longer do anything? Should those settings, especially "prefer power savings over performance," be turned off in order not to conflict with the frequency governor set up in this how-to?

Thanks.

[bodycoach2]

I used this when I had dapper on my machine, and it worked. I was able to throttle my cpu from 300 MHz, up to 2.8 GHz. I found that going lower than 1 GHz didn't increase battery life, but I used 1.4 when I was on batteries. I used the instructions from the Ubuntu document storage facility, but that site no longer comes up.

I upgraded to edgy, but now when I try to modprobe speedstep-centrino, it give me there error (not found). I tried the acpi one too, but no luck.

I know frequency scaling works on this computer, but with the upgrade to edgy, I can't get it going.

[bodycoach2]

I used this when I had dapper on my machine, and it worked. I was able to throttle my cpu from 300 MHz, up to 2.8 GHz. I found that going lower than 1 GHz didn't increase battery life, but I used 1.4 when I was on batteries. I used the instructions from the Ubuntu document storage facility, but that site no longer comes up.

I upgraded to edgy, but now when I try to modprobe speedstep-centrino, it give me there error (not found). I tried the acpi one too, but no luck.

I know frequency scaling works on this computer, but with the upgrade to edgy, I can't get it going.

Ubuntu Document Storage Facility is back up. I found the answer:

sudo modprobe p4_clockmod

Frequency scaling is working. Most excellent.

[jbmech006]

I am having the same problem with the clock speed being stuck at 1Ghz. I followed the steps and everything was working great until I restarted. After I restarted the CPU freq was stuck at 1Ghz. I ran through the steps again with no success. I tried to run $sudo modprobe p4_clockmod and got the following error "FATAL: Error inserting p4_clockmod (/lib/modules/2.6.17-11-386/kernel/arch/i386/kernel/cpu/cpufreq/p4-clockmod.ko): Device or resource busy" Do I need to kill some process before I attempt to run that command? Thanks for any help you guys have.

[jbmech006]

I should have posted this above, this is my CPU information:

Intel Core Duo
processor: 0
vendor_id: GenuineIntel
cpu family: 6
model: 14
model name: Genuine Intel(R) CPU T2400 @ 1.83GHz
stepping: 8
cpu MHz: 1000.000
cache size: 2048 KB
fdiv_bug: no
hlt_bug: no
f00f_bug: no
coma_bug: no
fpu: yes
fpu_exception: yes
cpuid level: 10
wp: yes
flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc up pni monitor vmx est tm2 xtpr
bogomips: 3661.77

[Steve White]

pharcyde,

You might also want to point out to your duller readers that if they have dual cores, they should repeat the governor setting for each core. (Would have helped me.)

[jbmech006]

Yeah I have instances of the scaling_governor for each cpu, so that's not the problem. Still need input on how to fix the scaling support.

[fNNR]

Hi

I'm a super-noob, and I don't quite understand step 6. Could someone maybe explain it a little better for me, perhaps with an example of what to type in at the kernel?

Thanks in advance!