Red Hat Bugzilla – Bug 865998
kernel-3.6.1-1.fc17.x86_64 full cpu load
Last modified: 2013-03-13 08:21:32 EDT
Description of problem:
kernel-3.6.1-1.fc17.x86_64 runs at full cpu speed (thinkpad x1; http://www.smolts.org/client/show/pub_6e14dcd1-2e28-4a5b-9eb0-493939585f99); laptop case is getting really, really hot. booting to kernel-3.5.6-1.fc17.x86_64 works as expected, i.e. cpu power stepping does work.
i tried to report w/ abrt (to get add'l info automatically collected), bat does not seem be a use case for abrt.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. boot into kernel-3.6.1-1
laptop runs really hot
cpu power stepping works
if the cpu frequency isn't changing, it's likely because something is keeping it busy.
what does top say when it's hot ? or powertop ?
nothing unusual. top shows things running at usual load, i.e. thunderbird being on top with approx. <15%. powertop only shows that the fan is running at 4000+ rpm. i'm running fedora on the laptop for 3/4 year, but never did it get that hot. it was basiccaly running in turbo mode all the time.
i removed that kernel from the system (to prevent accidents). do need me to reinstall and test sth. or gather info? if so, whoich/what?
updated to 3.6.3-1.fc17.x86_64. after suspend, laptop comes up and fan goes into full speed. powertop shows practically no cpu load but 100% gpu activity, which is odd because nothing gpu demanding is running. see attachments.
Created attachment 634759 [details]
powertop idle stats
Created attachment 634760 [details]
powertop frequency stats
Created attachment 634761 [details]
powertop device stats
i'm currently running 3.6.5-1.fc17.x86_64 and the problem persists. however, because of bug 820087 i also installed kernel-debug and was running with it the last couple of days. with kernel-debug everything was fine, though a bit sluggish. when i switched to the "normal" kernel everything seemed fine at first too until i did a suspend/resume cycle. after that the fan immediately starts up and stays at 4000+ rpm. top does not show any process activity above 2%, but powertop reports the gpu being 100% active in the idle stats (and not using any of the rc states), device stats report about 40 ops/s for the gpu.
updated to 3.6.6-1.fc17.x86_64. normal kernel still puts the fan into full speed after resume from suspend; both cpu and gpu stats show full speed values in powertop. however, with the debug kernel this does not happen. is the power management/speed stepping broken?
- kernel-3.6.7-4.fc17.x86_64 exhibits the problem; kernel-debug-3.6.7-4.fc17.x86_64 doesn't
- kernel-3.6.8-2.fc17.x86_64 also let's the fan as well as the cpus run at full speed; what is new is that this also happens now with kernel-debug-3.6.8-2.fc17.x86_64
any chance this might get fixed sooner than later?
Are you still seeing this with 3.7.9 or 3.8.2 in updates-testing?
well, no, i don't see this anymore, but i also switched laptops mid-december last year. so, it's probably best to close this report. thanks.
OK, thanks for letting us know.