linux-kernel - Re: Suspend to RAM doesn't work anymore in 2.6.21

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Message-Id: <200703200154.49695.tobias.doerffel@gmail.com>
Date:	Tue, 20 Mar 2007 01:54:45 +0100
From:	Tobias Doerffel <tobias.doerffel@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Suspend to RAM doesn't work anymore in 2.6.21

On Monday 19 March 2007 22:43:20 you wrote:
> Hi,
>
> On Monday, 19 March 2007 13:50, Tobias Doerffel wrote:
> > Hi,
> >
> > Suspend to RAM used to work fine on my computer (Intel Core Duo, 1 GB
> > RAM, Intel 82801G (ICH7-chipset) mainboard, NVIDIA-gfx-card,
> > tg3-ethernet) up to 2.6.20.3. But no matter which rc of 2.6.21 I use,
> > suspend to RAM doesn't work anymore. Up to rc3 even suspending stopped at
> > "suspending console" which appearently seems to be fixed in rc4. I tried
> > rc4-git4 with minimal config (no dyndicks, no HRT, no MSI, no sound, no
> > bluetooth, no PCMCIA, no WLAN, no USB, no cpufreq) but still I can't
> > resume properly. Caps works and I can login through SSH. Back to a more
> > complete config (sound, MMC, WLAN, PCMCIA - still no dynticks or HRT -
> > see attachment "config") I get exactly the same behaviour.
> >
> > When logged in through SSH after resume I saved output of dmesg (which
> > includes full power management debug messages), see
> > attachement "dmesg-resume". The system basically seems to be back but lot
> > of things do not work such as loading/unloading e.g. my WLAN-driver
> > (ipw3945), running "top" or "dstat" etc.   "uptime" always returns 0 min,
> > even with power management debug disabled.
> >
> > Kernel:
> > Linux version 2.6.21-rc4 (gcc version 4.1.2 20061115 (prerelease) (Debian
> > 4.1.1-21)) #23 SMP PREEMPT Mon Mar 19 12:27:56 CET 2007
I made some further investigations on this issue. A complete bisect between 
2.6.20 and 2.6.21-rc4-git4 stops at a stage 
(a4bbb810dedaecf74d54b16b6dd3c33e95e1024c) where I'm not able to compile the 
kernel anymore because of compiling-errors in arch/i386/kernel/setup.c 
(ACPI-related compiling errors). Stepping some revisions back until it 
compiled again resume didn't work either.

So I started all over again with bisect only on arch/i386 and ended up at 
ceb6c46839021d5c7c338d48deac616944660124 as the bad commit. But this file 
seems to be some kind of finalization of a series of patches ("ACPICA: Remove 
duplicate table manager") so I guess it's hard to debug this thing...

> Can you please do
>
> # echo test > /sys/power/disk
> # echo disk > /sys/power/state
>
> (the system should freeze tasks, suspend devices, disable nonboot CPUs,
> wait for 5 seconds, enable nonboot CPUs, resume devices, thaw tasks and
> return to your command prompt) and see if you can reproduce the problem?
Same problem here. Works fine in 2.6.20 as well as before 
ceb6c46839021d5c7c338d48deac616944660124. Doesn't work on recent 
2.6.21-rc4-git4.

Any more information I can give?

Tobias

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