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Date: Thu, 27 Jul 2017 21:42:44 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Tomi Sarvela <tomi.p.sarvela@intel.com>
cc: Martin Peres <martin.peres@linux.intel.com>, jeffy.chen@rock-chips.com,
        linux-kernel@vger.kernel.org
Subject: Re: Suspend-resume failure on Intel Eagle Lake Core2Duo
In-Reply-To: <ddc71535-02de-5b42-934f-70bc5ad43bb7@intel.com>
Message-ID: <alpine.DEB.2.20.1707272138080.2368@nanos>
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On Thu, 27 Jul 2017, Tomi Sarvela wrote:

> On 27/07/17 10:42, Thomas Gleixner wrote:
> > On Thu, 27 Jul 2017, Tomi Sarvela wrote:
> > > On 26/07/17 17:26, Thomas Gleixner wrote:
> > > > So reverting that commit does not help. Does it help on your machine?
> > > 
> > > Yes. Reverting it does not cause the machine to lock up on resume.
> > > 
> > > I haven't tested if the machine locks up later on, but at least it
> > > survives
> > > couple of s/r cycles.
> > 
> > Can you please try to add 'nohpet' to the kernel command line?
> 
> Option nohpet didn't change anything, still hangs on s/r.

Ok. Was a shot in the dark. I tried on a similar machine, but that one
resumes fine (except that the AHCI controller plays silly buggers, but
nothing interrupt related). I might have access to another core2duo machine
tomorrow.

I'll send you a debug patch shortly, but can you please first check when
the wreckage happens by testing the states in

    /sys/power/pm_test

freezer
devices
platform
processors
core

That might give some first hint to narrow down the issue.

Debug patch follows soon.

Thanks,

	tglx