linux-kernel - Re: Suspend/resume regression between 2.6.26 and 2.6.27-rc1

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Date:	Thu, 16 Oct 2008 16:21:53 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Zhao Yakui <yakui.zhao@...el.com>
Cc:	linux-kernel@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
	Len Brown <lenb@...nel.org>,
	"linux-acpi" <linux-acpi@...r.kernel.org>,
	"Li, Shaohua" <shaohua.li@...el.com>, mingo@...e.hu
Subject: Re: Suspend/resume regression between 2.6.26 and 2.6.27-rc1

On Thursday, 16 of October 2008, Zhao Yakui wrote:
> On Fri, 2008-10-10 at 14:41 +0200, Rafael J. Wysocki wrote:
> > On Friday, 10 of October 2008, Zhang Rui wrote:
> > > Hi, len,
> > > 
> > > this is the ACPI regression test result based on the latest ACPI test branch.
> > > 
> > > 1. on Acer:(AMD CPU, VIA chipset. 64 bit kernel)
> > > When doing S3 test, after pressing the power button, the system
> > > reboots instead of resuming. But if S3 is done after S4, the system can
> > > resume very well after pressing power button or using the RTC
> > > alarm.
> > > Note that this is an upstream regression as it can be reproduced on
> > > linus' tree.
> > > Yakui is investigating this issue.
> > 
> > We had some reports of the second suspend (S3) failure too, where the second
> > attempt to suspend to RAM (or to resume from it) failed after a successful
> > one.  I wonder if that's related.
> Some suspend/resume tests are done on one Acer laptop(AMD CPU, VIA
> chipset, 64-bit kernel).
>    The system will be rebooted when pressing power button after the box
> enters S3 state. But if S3 is done after doing S4, the system can be
> resumed very well after pressing power button.This issue can be
> reproduced on the upstream kernel.
> 
> After the further test we can confirm that this is a regression. The
> 2.6.26 kernel can work well on this box. But the 2.6.27-rc1 will fail.
> 
> After using the git-bisect it is confirmed that the commit
> 736f12bff9d9e7b4e895c64f73b190c8383fc2a1 is good. 
>     >commit 736f12bff9d9e7b4e895c64f73b190c8383fc2a1
>     >Author: Glauber Costa <gcosta@...hat.com>
>     > Date:   Tue May 27 20:14:51 2008 -0700
>        >x86: don't use gdt_page openly.
> 
> And the commit 
> 55f262391a2365d657a00ed68edd1a51bca66af5 is bad. 
>    >commit 55f262391a2365d657a00ed68edd1a51bca66af5
>    >Author: Yinghai Lu <yhlu.kernel@...il.com>
>    >Date:   Wed Jun 25 17:54:23 2008 -0700
>     >x86: rename setup_32.c to setup.c
> 
>   The patches between the above two commits are related with X86. When
> using git-bisect between the above two commits, we will get the
> compiling errors(For example: some files don't exist) or the kernel
> panic. So we can't continue using git-bisect to identify which commit
> the regression is caused by.

If you test SMP kernels on a non-SMP box, that may be
http://bugzilla.kernel.org/show_bug.cgi?id=11568.  In which case, please test
the patch from http://bugzilla.kernel.org/show_bug.cgi?id=11568#c46 .

Thanks,
Rafael
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