linux-kernel - Re: [PATCH] x86: revert "x86: Fix S4 regression"

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Message-Id: <201206152109.55091.rjw@sisk.pl>
Date:	Fri, 15 Jun 2012 21:09:54 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	Cong Wang <amwang@...hat.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Young <dyoung@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Yinghai Lu <yinghai.lu@...cle.com>
Subject: Re: [PATCH] x86: revert "x86: Fix S4 regression"

On Friday, June 15, 2012, Takashi Iwai wrote:
> At Fri, 15 Jun 2012 19:11:12 +0800,
> Cong Wang wrote:
> > 
> > On Tue, Jun 12, 2012 at 1:21 PM, Cong Wang <amwang@...hat.com> wrote:
> > >
> > > Takashi, could you help to test if the S4 regression is still
> > > there after this patch?
> > 
> > Hello,
> > 
> > Any comments?
> > 
> > I have tested this revert on my laptop, with running simple
> > "suspend and resume" test for several times, I didn't see any
> > problem.
> 
> Sorry for the late response.
> 
> The problem happens only on certain laptops.  I've tested the recent
> IvyBridge laptops and these were OK with the reverted patch.  But a
> SandyBridge laptop, the one I tested in the last year, still hits the
> S4 problem with the reverted kernel.
> 
> But, the recent kernels seem to have other S4 problems on this
> machine, so it's not 100% clear whether it's triggered by that.
> At least, it jumpts to the boot at S4 resume more frequently when the
> patch is reverted.
> 
> So, I need to start from 2.6.32 again to see what regressions have
> been introduced.  It'll take time, since I'd have to S4 20 cycles
> for reproducing the bug.

Thanks for doing this, please let me know if there's any way I can help.

Rafael
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