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

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Date:	Mon, 18 Jun 2012 11:10:03 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	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>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Yinghai Lu <yinghai.lu@...cle.com>
Subject: Re: [PATCH] x86: revert "x86: Fix S4 regression"

On Fri, Jun 15, 2012 at 8:15 PM, Takashi Iwai <tiwai@...e.de> 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.

Yeah, but the crashkernel=512M regression seems to happen
on more machines. :)

>
> 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.
>

Ok, thanks for your update!
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