Re: s2ram on Lenovo X300 is broken

Re: s2ram on Lenovo X300 is broken

[Rafael J. Wysocki]

On Sunday 26 April 2009, Kaushik Barde wrote:
> I am using stable-2.6.29.1 on Lenovo X300.
> 
> echo mem > /sys/power/state works if I disable AP core using echo 0 > /sys/devices/system/cpu/cpu1/online.
> 
> With SMP, first s3 cycle goes through, subsequent suspend does not work.
> 
> Is this a known issue with CPU_HOTPLUG or suspend re-ordering code?

Similar symptoms have been reported, but the previous reporter did not connect
them with the CPU hotplugging.

The issue isn't actually known and suspend-resume works on many SMP systems.

Is the problem reproducible with the current mainline kernel?

Rafael

RE: s2ram on Lenovo X300 is broken

[Kaushik Barde]

I tried with both stable 2.6.28.9 and 2.6.29.1, and yes, issue is reproducible.

On 28.9, if move AP (disable_nonboot_cpu) before suspend_console followed by a msleep(500), and keep it seem to work OK. But I don't like it.

On 29.1, looks like order is changed again, that solution does not work.

Either-way, its stopping somewhere in __cpu_down, I need to track it down.

-Kaushik

-----Original Message-----
From: linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-owner@vger.kernel.org] On Behalf Of Rafael J. Wysocki
Sent: Sunday, April 26, 2009 4:12 PM
To: Kaushik Barde
Cc: linux-acpi@vger.kernel.org
Subject: Re: s2ram on Lenovo X300 is broken

On Sunday 26 April 2009, Kaushik Barde wrote:
> I am using stable-2.6.29.1 on Lenovo X300.
> 
> echo mem > /sys/power/state works if I disable AP core using echo 0 > /sys/devices/system/cpu/cpu1/online.
> 
> With SMP, first s3 cycle goes through, subsequent suspend does not work.
> 
> Is this a known issue with CPU_HOTPLUG or suspend re-ordering code?

Similar symptoms have been reported, but the previous reporter did not connect
them with the CPU hotplugging.

The issue isn't actually known and suspend-resume works on many SMP systems.

Is the problem reproducible with the current mainline kernel?

Rafael
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Re: s2ram on Lenovo X300 is broken

[Rafael J. Wysocki]

On Monday 27 April 2009, Kaushik Barde wrote:
> I tried with both stable 2.6.28.9 and 2.6.29.1, and yes, issue is reproducible.

I thought of 2.6.30-rc3 (or later).

Thanks,
Rafael

RE: s2ram on Lenovo X300 is broken

[Kaushik Barde]

I will try it, is there something different about suspend ordering/hotplug in 2.6.30-rc3?

Thanks.
-Kaushik

-----Original Message-----
From: Rafael J. Wysocki [mailto:rjw@sisk.pl] 
Sent: Monday, April 27, 2009 1:32 PM
To: Kaushik Barde
Cc: linux-acpi@vger.kernel.org
Subject: Re: s2ram on Lenovo X300 is broken

On Monday 27 April 2009, Kaushik Barde wrote:
> I tried with both stable 2.6.28.9 and 2.6.29.1, and yes, issue is reproducible.

I thought of 2.6.30-rc3 (or later).

Thanks,
Rafael

Re: s2ram on Lenovo X300 is broken

[Rafael J. Wysocki]

On Monday 27 April 2009, Kaushik Barde wrote:
> I will try it, is there something different about suspend ordering/hotplug in 2.6.30-rc3?

Yes, there is.  Non-boot CPUs are now disabled after the late suspend of
devices and they are enabled before the early suspend of devices.

Thanks,
Rafael

 
> -----Original Message-----
> From: Rafael J. Wysocki [mailto:rjw@sisk.pl] 
> Sent: Monday, April 27, 2009 1:32 PM
> To: Kaushik Barde
> Cc: linux-acpi@vger.kernel.org
> Subject: Re: s2ram on Lenovo X300 is broken
> 
> On Monday 27 April 2009, Kaushik Barde wrote:
> > I tried with both stable 2.6.28.9 and 2.6.29.1, and yes, issue is reproducible.
> 
> I thought of 2.6.30-rc3 (or later).