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#1 2012-10-16 10:35:05

jrk
Member
From: Nämberch
Registered: 2012-10-16
Posts: 29

Update 3.5.6-1-ARCH to 3.6.2-1-ARCH breaks ondemand governor

uuuHello,

as the title says, the ondemand cpu frequency governor seems to be broken in 3.6.*.
The sympton is that my cpu (i5-something, Thinkpad X220) is constantly set to 2.5 GHz (max) whether I'm on battery or ac.

The cpupower frequency-info command reports 800 MHz (min) which is wrong.
Powertop reports the correct frequencies, as does the sys interface (/sys/devices/system/cpu/cpu?/).

Furthermore I cannot set the frequency manually using /sys/devices/system/cpu/cpu?/cpufreq/scaling_setspeed, which reports <unsupported>.
(That's also true for 3.5, but throttling works here anyway).

I also tried to disable laptop-mode-tools and checked pm-utils (which do not set my cpu frequency).
The only solution for now seems to be a downgrade from 3.6 to 3.5, which I've done.

Thus my conclusion is, that somethings broken with the cpu frequency scaling in 3.6.

Any advise, clues, suggestions?

Thanks and wishes!

[edit]
Boot parameters:

elevator=noop pcie_aspm=force
i915.i915_enable_rc6=1 i915.lvds_downclock=1 i915.i915_enable_fbc=1
iwlwifi.power_save=1 iwlwifi.power_level=5 iwlwifi.11n_disable=1
nmi_watchdog=0
snd_hda_intel.power_save=1
usbcore.autosuspend=1

Last edited by jrk (2012-10-16 10:43:53)

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#2 2012-10-16 13:09:31

dolby
Member
From: 1992
Registered: 2006-08-08
Posts: 1,581

Re: Update 3.5.6-1-ARCH to 3.6.2-1-ARCH breaks ondemand governor

bugzilla.kernel.org


There shouldn't be any reason to learn more editor types than emacs or vi -- mg (1)
[You learn that sarcasm does not often work well in international forums.  That is why we avoid it. -- ewaller (arch linux forum moderator)

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#3 2012-10-16 13:55:24

trsk
Member
Registered: 2012-10-14
Posts: 38

Re: Update 3.5.6-1-ARCH to 3.6.2-1-ARCH breaks ondemand governor

FYI: I'm using the X220 with an i7 and am not experiencing this issue.

EDIT: I was wrong, I AM experiencing this issue after resuming from suspend (90% of the time, sometimes it does work).

Last edited by trsk (2012-10-18 14:03:33)

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#4 2012-10-16 14:05:29

eduedix
Member
Registered: 2011-02-08
Posts: 35

Re: Update 3.5.6-1-ARCH to 3.6.2-1-ARCH breaks ondemand governor

i also have X220 i7 and am wondering what kind of configurations you have for powersaving. do you use laptop-mode or tlp?

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#5 2012-10-16 20:00:09

jrk
Member
From: Nämberch
Registered: 2012-10-16
Posts: 29

Re: Update 3.5.6-1-ARCH to 3.6.2-1-ARCH breaks ondemand governor

Hi,

I'm using laptop-mode-tools but I don't think that's the root of the problem.

Right now, I'm experiencing the behavior with kernel 3.5.6-1 too.

That's odd, I start to think that it might have something to do with the dock I'm using, but I cannot clearly correlate this.

cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_setspeed
800000
800000
800000
800000
cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_cur_freq
800000
800000
800000
800000
cat /sys/devices/system/cpu/cpu?/cpufreq/cpuinfo_cur_freq
2500000
2500000
2500000
2500000
 cat /sys/devices/system/cpu/cpu?/cpufreq/bios_limit
2501000
2501000
2501000
2501000

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#6 2012-10-18 12:39:27

eduedix
Member
Registered: 2011-02-08
Posts: 35

Re: Update 3.5.6-1-ARCH to 3.6.2-1-ARCH breaks ondemand governor

i think there is a bug in wireless driver : 03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34)

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