At Sun, 14 Mar 2010 16:03:52 -0400 (EDT),
Len Brown wrote:
>
> On Sun, 14 Mar 2010, Adam Sloboda wrote:
>
> > Hi all,
> >
> > I've noticed that after few days (maybe less, I wasn't paying
> > attention to power usage) grows by large margin and nothing can get it
> > back down, only reboot.
> >
> > I tried to turn off or restart every service with no success. Then I
> > tried to go to init 1 and even with 151.5 ms average residency in C6
> > (100 %) I couldn't get below 9 W (all power tricks applied, no wifi,
> > disk not spinning). I am able to get minimum of 7.4 W in desktop
> > environment after reboot (with wifi on).
> >
> > Then I tried to unload all kernel modules (modprobe -r) but the system
> > totally halted with no further response.
> >
> > I'm using Debian kernel 2.6.32-2-amd64. I will definitely try to
> > unload modules one by one next time but now I have no idea what the
> > problem might be (I really use only wifi but reload didn't help).
>
> Adam,
> Which method are you using to measure power consumption.
>
> If you've got a Nehalem-based laptop, you can use turbostat
> to verify the hardware C-state residency:
>
> http://userweb.kernel.org/~lenb/acpi/utils/pmtools-latest/turbostat/
Power usage is according to values exported by SMAPI (ThinkPad X200,
no ULV), powertop is giving only slightly bigger numbers. Average
residency is reported by powertop.
This is a Penryn P8600 CPU. I tried to narrow the problem down again,
here are the numbers:
http://disorder.sk/tmp/stats/
I guess it has to be some device, kernel and userspace interrupt
numbers are really minimal in single mode. My guess would be iwlagn
or i915 and reloading iwlagn is not helping at all.
Note: disk was spinning all the time so the numbers are over 8W.
Regards,
Adam
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