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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)
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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
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(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.
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#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
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*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?
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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.
If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is.
Simplicity is the ultimate sophistication.
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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.
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the cpufreq wiki is http://wiki.archlinux.org/index.php/Cpufreq
notice there that you can use also powernowd
If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is.
Simplicity is the ultimate sophistication.
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Thanks quarkup, I hadn't noticed the option to use powernowd. Works like a charm.
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