Arch Linux

deadspider187

Member

Registered: 2008-02-04

Posts: 35

CPU not entering C states

I just bought a Gateway P-6831FX, which has a T5450 processor.  lspci shows a lot of unknown devices, so maybe that's the root of the problem, but I'll ask anyways.  Powertop shows the cpu being in C0 at all times, it there something I'm missing?

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (100.0%)        1.67 Ghz     0.0%
C1                0.0ms ( 0.0%)         1333 Mhz     0.0%
C2                0.0ms ( 0.0%)         1000 Mhz   100.0%
C3                0.0ms ( 0.0%)

Wakeups-from-idle per second : 92.5     interval: 5.0s
Power usage (ACPI estimate): 27.2W (1.6 hours)

Top causes for wakeups:
  47.1% ( 79.8)       <interrupt> : iwl4965, uhci_hcd:usb1, ohci1394, nvidia
  17.5% ( 29.6)      <kernel IPI> : Rescheduling interrupts
   6.0% ( 10.2)     mixer_applet2 : schedule_timeout (process_timeout)
   4.7% (  8.0)   <kernel module> : usb_hcd_poll_rh_status (rh_timer_func)
   3.8% (  6.4)              Xorg : do_setitimer (it_real_fn)
   3.3% (  5.6)       <interrupt> : uhci_hcd:usb3, ehci_hcd:usb7

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1090T|HD4250|2GB|500GB|Arch x64
Ci7 2.66GHZ|HD5850|6GB|4x500GB|Win 7

byte

Member

From: Düsseldorf (DE)

Registered: 2006-05-01

Posts: 2,046

Re: CPU not entering C states

So, what did you try? Installed cpufreqd and set it up? There should be a howto in the wiki.

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1000

deadspider187

Member

Registered: 2008-02-04

Posts: 35

Re: CPU not entering C states

I have cpufreqd installed, but I did try acpid and cpudyn, still no go.  Even when the processor is idle it won't go below C0.

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1090T|HD4250|2GB|500GB|Arch x64
Ci7 2.66GHZ|HD5850|6GB|4x500GB|Win 7