linux-kernel - Re: [REGRESSION 2.6.34] Suspend fails in pm

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Message-Id: <201004210651.20056.rjw@sisk.pl>
Date:	Wed, 21 Apr 2010 06:51:19 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ben Gamari <bgamari.foss@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [REGRESSION 2.6.34] Suspend fails in pm_test=processor on Dell laptop

On Tuesday 20 April 2010, Rafael J. Wysocki wrote:
> On Sunday 18 April 2010, Ben Gamari wrote:
> > Hey all,
> > 
> > It seems that something in the 2.6.34 merge cycle has broken suspend to RAM on
> > my Dell Latitude D830. While suspend has been rock solid for several release
> > cycles, as of 2.6.34-rc4 it locks up on suspend. All of the pm_test options up
> > to processor work fine, precluding a driver issue.
> 
> Hmm, does the "processors" work?

Sorry, the subject says it doesn't.

> > Unfortunately, I've been unable to get any useful output from the serial
> > console during suspend. I'll try bisecting and report back when I have more
> > details. Let me know what else I can do to help.
> 
> I can't reproduce this, so it looks hardware or BIOS-related.  Or it's an
> obscure x86 bug.

Does switching CPU1 on/off by echoing 0/1 to

/sys/devices/system/cpu/cpu1/online

work?

Rafael
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