cpufreq broken?

genfive · Apprentice Joined: 10 Nov 2005 Posts: 291

After i upgraded to kernel 2.6.17-r4, the cpufreqd no longer works. cpufreq-info gives the following:

Brainfart · Posted: Wed Jul 26, 2006 5:03 am Post subject:

I had that problem when I tried 2.6.16, but I've not tried 2.6.17 yet (went back to 2.6.15)

tylerwylie · Posted: Wed Jul 26, 2006 7:27 pm Post subject:

I have this problem too, will probably jump back a kernel as well.

Bout to give it a go on the 2.6.16 kernel. Will update with results.

tylerwylie · Posted: Wed Jul 26, 2006 8:03 pm Post subject:

2.6.16 works for me, tried all the governors and frequencies, and they all work.

genfive · Apprentice Joined: 10 Nov 2005 Posts: 291

i got 2.6.17 working. the support must be built in kernel, instead of compiled as modules.

nichocouk · Guru Joined: 10 Mar 2005 Posts: 585 Location: Glasgow

mmmh, strange, I have the same problem that you describe in your first post - although I've just installed cpufreqd so I haven't tested it on other kernels - and I have support built in the kernel, not as modules.
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madams · Posted: Mon Jul 31, 2006 6:38 pm Post subject:

I stopped using the cpufreq daemon with the introduction of the CONFIG_CPU_FREQ_GOV_CONSERVATIVE kernel options.. Adjustment of the CPU is handled within the kernel (i.e. no need for the userspace daemon), unless of course you have some unusual needs that the 'conservative' governor doesn't satisfy..

I find the slew rates of the CPU freq. adjustments on 'conservative' option to be quite suitable for most laptop usage..

http://www.thinkwiki.org/wiki/How_to_make_use_of_Dynamic_Frequency_Scaling

hope this helps..

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genfive · Apprentice Joined: 10 Nov 2005 Posts: 291

I tried the conservative governor as a module, but found the change rate to be too slow. the same with ondemand, which made my screen too flashy... But then again, I am not a republican...

madams · Posted: Mon Jul 31, 2006 7:36 pm Post subject:

It is all configurable through the 'sysfs'. i.e by 'cat'ing the appropriate values to files in /sys/devices/system/cpu/cpu0/cpufreq/conservative

there is quite a bit of lattitude in setting the 'throttling' characteristics. (i.e how quickly it reacts to cpu loads)

[excerpted from /usr/src/linux-2.6.16-suspend2-r8/Documentation/cpu-freq/governors.txt]

nichocouk · Guru Joined: 10 Mar 2005 Posts: 585 Location: Glasgow

Thanks for the interesting HOWTO. Here is another one from the Gentoo Wiki. I've been reading through it very quickly but I was surprised to see that the author adds cpufrequtils to its runlevel rather than cpufreqd. What's the difference?
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madams · Posted: Mon Jul 31, 2006 8:50 pm Post subject:

nichocouk · Guru Joined: 10 Mar 2005 Posts: 585 Location: Glasgow

madams · Posted: Mon Jul 31, 2006 10:54 pm Post subject:

Those files are created by the kernel, so no, creating them by hand will do nothing as the kernel won't read them.. either a) you don't have the kernel options configured (under cpu frequency scaling), or b) you have them configured as modules and the modules are not loaded (i.e. need to 'modprobe' them)..

( I have heard that modules don't work, must be configured in the kernel itself).

dumb question, if you do in fact have them configured in the kernel.. did you remember to install the new kernel?? :wink:

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nichocouk · Guru Joined: 10 Mar 2005 Posts: 585 Location: Glasgow

cradlebin · n00b Joined: 18 Sep 2004 Posts: 32

I solved this error by doing:

Belgabor · n00b Joined: 03 Jul 2003 Posts: 63 Location: Germany

No, there's definately something broken. I just went from 2.6.17-rc5-mm1 to 2.6.18-rc2-mm1 using the same .config with 'make oldconfig' and /sys/.../cpufreq is gone (got a P4).

tobimat80 · Posted: Tue Sep 05, 2006 2:34 pm Post subject:

I experience the same problem. After doing a fresh 2006.1 install speedstepping with cpufreqd no longer works. I used a 2.6.16 and a 2.6.17 kernel. What is strange is the fact that cpufreqd worked before with the same 2.6.16 kernel ??
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xathin · n00b Joined: 05 Sep 2006 Posts: 64 Location: Vancouver, BC

I am also having this problem. I am using 2006.1, just installed, using suspend2-sources-2.6.17-r5 and am getting the same errors every time I try to start cpufreqd. I have everything built-in except for ACPI Processor P-States driver, which cannot be selected to be built-in. Simply using a governor would be fine, except for the fact that there is no /sys/devices/system/cpu/cpu0/cpufreq directory. As this is supposed to get created by the kernel, that would imply that there is something wrong with the kernel, would it not? Or at least those modules within the kernel.

Also, I noticed while building the kernel, I get the following warning:

Sachankara · Posted: Wed Sep 06, 2006 12:56 pm Post subject:

xathin · n00b Joined: 05 Sep 2006 Posts: 64 Location: Vancouver, BC

Ok...I got my suspend2-sources-2.6.17-r5 to work with cpufreqd. I emerged the previous version (suspend2-sources-2.6.16-r12) and configured that as I normally would. Tried running cpufreqd, and everything worked fine, as it always did. I then copied the .config file into the other directory (2.6.17-r5) and ran "make oldconfig". Chose mostly the default options for things that changed, and built the new kernel. After booting into the new kernel, the file system for cpu scaling was there, and cpufreqd started without any problems.

I'm guessing there was an option that was changed from the previous version that caused this to happen. Hope this helps everyone having similar problems. I would assume that the same could be done with any of the sources available. Now to just figure out how to get my wireless card working with the kernel native drivers, and I'll be set.

noice · Posted: Thu Sep 07, 2006 9:27 pm Post subject: Re: cpufreq broken?

tomatopi · Posted: Fri Sep 15, 2006 3:38 pm Post subject:

I'm also having the problem of missing /sys/devices/system/cpu/cpu0/cpufreq.

grep CPU_FREQ .config:

kamracik · Posted: Wed Oct 04, 2006 7:20 am Post subject:

i have problem with linux-2.6.18-gentoo just cant make scaling working.. https://forums.gentoo.org/viewtopic-t-504187-highlight-.html
with previous version everything just work fine and with even make oldconfig its fails