linux-kernel - Re: clockevents: fix resume logic

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Date:	Wed, 12 Sep 2007 02:12:48 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	john stultz <johnstul@...ibm.com>, Ingo Molnar <mingo@...e.hu>,
	Len Brown <lenb@...nel.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: Re: clockevents: fix resume logic

On Tue, 11 Sep 2007 21:52:01 +0200 Thomas Gleixner <tglx@...utronix.de> wrote:

> On Tue, 2007-09-11 at 11:44 -0700, Andrew Morton wrote:
> > > > there doesn't seem to be a lot of difference in the time handling, except
> > > > there are large changes in when things happen in the bootup sequence.
> > > 
> > > The question is whether the system goes into C2 with the patch applied.
> > > 
> > > Can you please provide the output of /proc/acpi/processor/CPU0/power for
> > > both the bad and the good one ?
> > > 
> > 
> > good:
> > 
> > sony:/home/akpm> cat /proc/acpi/processor/CPU0/power
> > active state:            C0
> > max_cstate:              C8
> > bus master activity:     00000000
> > maximum allowed latency: 8000 usec
> > states:
> >     C1:                  type[C1] promotion[--] demotion[--] latency[001] usage[00000000] duration[00000000000000000000]
> >     C2:                  type[C2] promotion[--] demotion[--] latency[001] usage[00000000] duration[00000000000000000000]
> > 
> > bad:
> > 
> > sony:/home/akpm> cat /proc/acpi/processor/CPU0/power
> > active state:            C2
> > max_cstate:              C8
> > bus master activity:     00000000
> > maximum allowed latency: 8000 usec
> > states:
> >     C1:                  type[C1] promotion[C2] demotion[--] latency[001] usage[00000010] duration[00000000000000000000]
> >    *C2:                  type[C2] promotion[--] demotion[C1] latency[001] usage[00008316] duration[00000000000170717293]
> 
> Ok, here we are. The bad one uses C2 which stops the local apic on the
> VAIO. I suspect we end up in the suspend/resume with going into C2
> without the broadcast active.
> 
> Can you try to get the output of SysRq-Q during the "it needs help from
> keyboard" period ?
> 

That's a bit tricky because hitting the keyboard is what unsticks things. 
And the video is black after resume-from-RAM (has always been thus) and we
broke netconsole-over-e100-during-resume back in 2.6.21 or thereabouts.

<struggles a bit>

Here: http://userweb.kernel.org/~akpm/x.txt
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