RE: Processor C states and USB problem

["Yu, Luming" <luming.yu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

> I picked up this thread and I'm interested in knowing a bit more about
> bus mastering and C3, as my laptop never goes into C3. I own a Dell
> Inspiron 8500 (details at
> http://ltswww.epfl.ch/~dsanta/resources/dell-i8500-linux).
> 
> This is what I get for the power states:
> # cat /proc/acpi/processor/CPU0/power
> active state:            C2
> default state:           C1
> bus master activity:     ffffffff
> states:
>     C1:                  promotion[C2] demotion[--] 
> latency[000] usage[00039800]
>    *C2:                  promotion[C3] demotion[C1] 
> latency[050] usage[00573330]
>     C3:                  promotion[--] demotion[C2] 
> latency[050] usage[00000004]
> 
> I tried booting with init=/bin/sh and manually loading the processor
> module, without any external hardware attached, so that no special
> hardware is initialized, but still there is non-stopping bus mastering
> activity. What could be causing it? Any ideas how could I find out?

I just filed a tracker http://bugme.osdl.org/show_bug.cgi?id=1839.


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