Re: 2.6.25 pci=noacpi

Thomas Renninger
2008-05-08T11:06:07Z

On Thu, 2008-05-08 at 08:23 +0100, Richard wrote:
> Thomas Renninger wrote:
...

> >>>> thanks - the idle=poll works to fix the problem.
> >>>>
> >>> Well, that's hardly a "fix". The power consumption will be very high.
> >>>
> >> Hehehe, its a start. A booting kernel is definitely a good start (even
> >> one what drinks battery). I have some avenues in the source to
> >> investigate, but being a ACPI n00bie its trying to get my head around
> >> the mass of code thats a daunting task.
> >>
> > Richard, could you try processor.max_cstate=2 (or even 1), pls (without
> > noapictimer).
> > Or you can double check whether you have cstates at all first(when
> > booting with noapictimer):
> > cat /proc/acpi/processor/*/power
> >
> > Vendors often invalidate deeper sleep states with an invalid latency.
> > Maybe this has been forgotten here, Windows does not use deeper C-state
> > or it works there for some reason.
> > If this works for you, please send dmidecode output.
> > IMO we should then blacklist this machine in
> > drivers/acpi/processor_idle.c to not use the offending sleep state.
> > There already is a blacklist.
> >
> > Thanks,
> >
> > Thomas
> >
> >
> >
> Hi Thomas (and all)
>
> I tried the processor.max_cstate=2 to no avail. on a 23, 24 and a .25
> kernel :-P The machine shuts down just after INIT starts.
Could you also try processor.max_cstate=1 (one kernel is enough, just a
quick test... )
The culprit is in the idle routine and there just the C-states are
triggered..., it should be related to C-states.

> ------------- This is reported when booted with noapictimer ----------------
> cat /proc/acpi/processor/*/power
> active state: C0
> max_cstate: C8
> bus master activity: 00000000
> maximum allowed latency: 6666 usec
> states:
> C1: type[C1] promotion[--] demotion[--]
> latency[000] usage[00082490] duration[00000000000000000000]
> C2: type[C2] promotion[--] demotion[--]
> latency[018] usage[00000000] duration[00000000000000000000]
I wonder why even C2 is not entered with noapictimer...
> C3: type[C3] promotion[--] demotion[--]
> latency[083] usage[00000000] duration[00000000000000000000]
> ----------------------------------------------------------------------------------

Thomas