Arch Linux

ammon

Member

Registered: 2008-12-11

Posts: 413

Cpufreq scaling gone after CPU upgrade

Hello,
I've just replaced my t7250 core2duo CPU with t8300 (same fsb speed, but 3MB lv2 cache, and 45nm so it is cooler).
This is Asus F3 laptop, Intel mobile 965 chipset (does support this cpu).
Kernel version is 3.2.16

Problem is, cpu-freq is not working no more so CPU is locked to 1.2Ghz (half of total speed).

cpuinfo reports as expected:

cat /proc/cpuinfo 
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model	 : 23
model name	: Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz
stepping	: 6
cpu MHz	 : 2394.321
cache size	: 3072 KB
physical id	: 0
siblings	: 2
core id	 : 0
cpu cores	: 2
apicid	 : 0
initial apicid	: 0
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 pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm dts tpr_shadow vnmi flexpriority
bogomips	: 4788.64
clflush size	: 64
cache_alignment	: 64
address sizes	: 36 bits physical, 48 bits virtual
power management:

cpufreq driver is missing:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
cat: /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver: No such file or directory

cpufreq-info reports something strange:

analyzing CPU 0:
no or unknown cpufreq driver is active on this CPU
maximum transition latency: 4294.55 ms.
analyzing CPU 1:
no or unknown cpufreq driver is active on this CPU
maximum transition latency: 4294.55 ms.

My guess is that BIOS messed up something, and kernel is confused. However there are no errors in dmesg.
BIOS reports 1.2Ghz speed also.

I've found this, similar issue but for windows http://www.notebookforums.com/t/227631/ … pu-upgrade
They found workaround for cpu multiplier, but what about missing cpu drivers?

siriusb

Member

From: Hungary

Registered: 2010-01-01

Posts: 422

Re: Cpufreq scaling gone after CPU upgrade

Some tips:
- Look into the log files
- Be sure acpi_cpufreq module is loaded
- In BIOS choose Load defults option.

ammon

Member

Registered: 2008-12-11

Posts: 413

Re: Cpufreq scaling gone after CPU upgrade

It is BIOS, confirmed it.
It does not contain microcode for this cpu.
There is a way to import microcode without BIOS?
To workaround this BIOS thing...

http://downloadcenter.intel.com/Detail_ … e=Firmware

Does someone have some experience with this?

Back to the topic:

modprobe acpi-cpufreq 
FATAL: Error inserting acpi_cpufreq (/lib/modules/3.2.0-2-amd64/kernel/drivers/cpufreq/acpi-cpufreq.ko): Input/output error

Module can not be loaded.

Nothing in the logs...

Last edited by ammon (2012-05-28 14:27:12)

anonymous_user

Member

Registered: 2009-08-28

Posts: 3,059

Re: Cpufreq scaling gone after CPU upgrade

Does installing intel-ucode help?

http://www.archlinux.org/packages/extra … tel-ucode/

ammon

Member

Registered: 2008-12-11

Posts: 413

Re: Cpufreq scaling gone after CPU upgrade

Installed it, this is my debian box but it is the same procedure.
It does not help, cpu is still semi-usable.

anonymous_user

Member

Registered: 2009-08-28

Posts: 3,059

Re: Cpufreq scaling gone after CPU upgrade

You do realize these forums are for Arch Linux support, right?

https://wiki.archlinux.org/index.php/Fo … pport_ONLY

ammon

Member

Registered: 2008-12-11

Posts: 413

Re: Cpufreq scaling gone after CPU upgrade

@anonymous_user

I am arch user, I own several linux machines and this one is atm on debian (however it spent most of its lifetime running arch)
So, don't be b**ch about it. I asked here because I know if anyone on internet is capable to fix something like this is Arch community.