CPU Frequency scaling on Pentium M

murderbymodem · 2009-09-17 01:42:20

Hey all. I have a Dell 600m laptop currently running Arch. My only problem is that I cannot get cpufreq support working properly. I can switch between power save and performance, but the conservative and ondemand governors do not work.

ondemand governor failed, too long transition latency of HW, fallback to performance governor

I had a few people helping me on IRC, and they thought it was due to having to run the p4-clockmod module since the acpi-cpufreq and speedstep-ich modules would not work for me.

Is there any way to get the ondemand governor to work? My battery life is really crappy.

Last edited by murderbymodem (2009-09-17 01:43:39)

Army · 2009-09-17 09:18:53

What does your /etc/conf.d/cpufreq look like? I have a Pentium M as well and it works perfectly for me with this config

#configuration for cpufreq control

# valid governors:
#  ondemand, performance, powersave,
#  conservative, userspace
governor="ondemand"

# valid suffixes: Hz, kHz (default), MHz, GHz, THz
#min_freq="2.25GHz"
#max_freq="3GHz"

(only the last two lines are different from the unedited file)
and @cpufreq in the DAEMONS line in rc.conf

Babets · 2009-09-17 11:54:21

Army wrote:

(only the last two lines are different from the unedited file)

The last two line can remain commented because it seems that cpufreq can determines the limits automatically.

murderbymodem · 2009-09-18 14:06:32

#configuration for cpufreq control

# valid governors:
#  ondemand, performance, powersave,
#  conservative, userspace
governor="ondemand"

# valid suffixes: Hz, kHz (default), MHz, GHz, THz
min_freq="188MHz"
max_freq="1.50GHz"

I used cpufreq-info, which said that I should set it to 188mhz min and 1.5ghz max, so that's what I entered

signal9 · 2009-12-20 23:33:37

*bump*

I'm also having this problem. I'm running Arch with the 2.6.31 kernel on an Asus Eee 701. Everythings great except cpu scaling. I'm using p4_clockmod and the ondemand governor and I get the same error about latency.

Any new ideas on this?

quarkup · 2009-12-21 10:32:39

Actually I am willing to try it on my pentium-m centrino

check this. it may help you somehow:
http://ubuntuforums.org/showthread.php?t=394911

that

CPUFREQ_CPU_MODULE="speedstep-centrino"

may help you but im not sure.

Gusar · 2009-12-21 11:02:42

For Pentium-M, acpi-cpufreq (in the kernel configuration listed as 'ACPI Processor P-States driver') is the correct driver. I know, I have one (Pentium-M Dothan, 1.73Ghz).

As for the EEE 701, which has a celeron processor, are you guys sure it's even capable of clockmod? Even if it is, this is what the kernel says about p4-clockmod:

This driver should be only used in exceptional
circumstances when very low power is needed because it causes severe
slowdowns and noticeable latencies.

So not really an ideal solution.

quarkup · 2009-12-21 11:09:29

the cpufreq wiki is http://wiki.archlinux.org/index.php/Cpufreq

notice there that you can use also powernowd

http://wiki.archlinux.org/index.php/Powernowd

signal9 · 2009-12-22 01:49:33

Thanks quarkup, I hadn't noticed the option to use powernowd. Works like a charm.

Arch Linux

#1 2009-09-17 01:42:20

CPU Frequency scaling on Pentium M

#2 2009-09-17 09:18:53

Re: CPU Frequency scaling on Pentium M

#3 2009-09-17 11:54:21

Re: CPU Frequency scaling on Pentium M

#4 2009-09-18 14:06:32

Re: CPU Frequency scaling on Pentium M

#5 2009-12-20 23:33:37

Re: CPU Frequency scaling on Pentium M

#6 2009-12-21 10:32:39

Re: CPU Frequency scaling on Pentium M

#7 2009-12-21 11:02:42

Re: CPU Frequency scaling on Pentium M

#8 2009-12-21 11:09:29

Re: CPU Frequency scaling on Pentium M

#9 2009-12-22 01:49:33

Re: CPU Frequency scaling on Pentium M

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