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DateWed, 9 Apr 2008 07:50:45 -0300
From"Carlos R. Mafra" <>
SubjectRe: 2.6.25-current-git hangs on boot unless CONFIG_CPU_IDLE=n-Apple
On Sun  6.Apr'08 at 22:31:17 -0700, Pallipadi, Venkatesh wrote:
> >On Fri  4.Apr'08 at 13:41:45 -0700, Pallipadi, Venkatesh wrote:
> >> [...]> >> >>> >I've uploaded the picture where it hangs, it is in the very > >> >>beginning> >> >>> >of the boot process:> >> >>> >> >> >>> >http://www.ift.unesp.br/users/crmafra/dsc04673.jpg> >> >>> > >> >>> > >> >>> Can you try the latest git and see whether this still is > >a problem?> >> >>> >> >>I've just updated to latest git, but it may take some time for it 
> >> >>to happen again (the first 3 boots were okay). Last time > >it happened> >> >>with 2.6.25-rc7-00149-gaf8be4e (I checked now). > >> >>> >> >>Do you have reasons to believe this issue was fixed since then?> >> >> >> >Yes. I think the patch here should have fixed the problem....
> >> >Patch : http://marc.info/?l=linux-kernel&m=120674502201007&w=4> >> >> >> > >> Hmmmm.... Looking at latest git,> >> The above patch is not yet in git. Can you please apply the > >above patch> >> and see whether do you still see the problem.....> >> >I applied Venkatesh's patch from the link above on top of 
> >v2.6.25-rc8-139-ge315c12, but my laptop hung at the 11th boot with the
> >same state show here:> >http://www.ift.unesp.br/users/crmafra/dsc04673.jpg> >> >I waited 3'30" but the boot process never resumed, so I pressed
> >the power button.
> >
> >Any further patches I might try?> > Carlos,> > Hmm. So, we still have some bug hidden in there..> As this is similar to 10117, we should probably track this there.
> 10093 is a different cpuidle specific bug looks like, as it happens at a
> different place while switching between governors.> > Can you attach your kernel config, acpidump output and dmesg when kernel
> boots ok to that bugzilla.> Also, if you can please try processor.max_cstate=2 boot option and see
> whether you still can reproduce the problem. If you can, then try
> processor.max_cstate=1. For this boot option to work, you have to have
> ACPI_PROCESSOR built into your kernel (and should not be a module).

I booted the laptop many times yesterday (to test these things):

1) CONFIG_CPUIDLE=n seems to help. It didn't hang after 17 boots

2) processor.max_cstate=2 doesn't help, it hung at the 10th boot

3) processor.max_cstate=1 survived 20 boots without hanging

And when it hung, it always stop at the same point shown in
the picture quoted above.

I hope this will help.

Thanks for taking a look at the problem!



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