linux-kernel - Re: [3/5] 2.6.21-rc4: known regressions (v2)

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Date:	Sun, 25 Mar 2007 23:34:14 +0200
From:	Frédéric Riss <frederic.riss@...il.com>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, pavel@...e.cz,
	Tino Keitel <tino.keitel@....de>,
	Bob Moore <robert.moore@...el.com>, lenb@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [3/5] 2.6.21-rc4: known regressions (v2)

Le vendredi 23 mars 2007 à 19:50 +0100, Adrian Bunk a écrit :
> Subject    : MacMini: doesn't come out of suspend to ram
> References : http://lkml.org/lkml/2007/3/21/374
> Submitter  : Frédéric RISS <frederic.riss@...il.com>
>              Tino Keitel <tino.keitel@....de>
> Caused-By  : Bob Moore <robert.moore@...el.com>
>              commit c5a7156959e89b32260ad6072bbf5077bcdfbeee
> Status     : unknown

I spent some time this weekend investigating this issue more thoroughly.
In fact the regression caused by this commit has been corrected by
f3ccb06f3b8e0cf42b579db21f3ca7f17fcc3f38 (ACPI: Disable wake GPEs only
once.)  

However, as I pointed out in the initial report, the MacMini doesn't
come out of suspend to ram because a commit in another merged patchset
broke it. I tracked it down to:

commit e9e2cdb412412326c4827fc78ba27f410d837e6e
parent 79bf2bb335b85db25d27421c798595a2fa2a0e82 
Author: Thomas Gleixner <tglx@...utronix.de>
Date:   Fri Feb 16 01:28:04 2007 -0800

    [PATCH] clockevents: i386 drivers

This patch has already been mentioned in regression reports, but AFAICS
not related to suspend issues.

To be totally clear about what works and what doesn't:

79bf2bb335b85db25d27421c798595a2fa2a0e82 
   + cherry-pick f3ccb06f3b8e0cf42b579db21f3ca7f17fcc3f38  ==> works

e9e2cdb412412326c4827fc78ba27f410d837e6e
   + cherry-pick f3ccb06f3b8e0cf42b579db21f3ca7f17fcc3f38  ==> broken

To try to get more information, I commented the call to
do_suspend_lowlevel in drivers/acpi/sleep/main.c and used
CONFIG_DISABLE_CONSOLE_SUSPEND. Interestingly, the suspend/resume cycle
completes correctly in this mode.

Fred.

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