Re: C3 on Travelmate 8000

Nate Lawson
2004-09-06T03:35:09Z

> on my Travelmate 8005 (with Pentium M - Dothan) there is constant bus
> master activity. I already tried to disable USB, PCMCIA, Network,
> Framebuffer, Cpufreq etc., but even with a minimalistic system there ist
> still the following output of /proc/acpi/processor/CPU0/power:
>
> active state: C2
> default state: C1
> bus master activity: ffffffff
> states:
> C1: promotion[C2] demotion[--] latency[000]
> usage[00000010]
> *C2: promotion[C3] demotion[C1] latency[001]
> usage[00901857]
> C3: promotion[--] demotion[C2] latency[085]
> usage[00000000]
>
> Is there anything else I can do? Or can I somehow find out, what is
> causing the bus master activity? Disabling the bm_check=1 in the
> processor.c code works, but that is probably the wrong solution.

You should check the processor/chipset errata ("specification update" in
Intel-language). Perhaps the BM status register is broken on your
particular chipset.

--
Nate

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