linux-kernel - Re: Suspend on Dell D420

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Date:	Fri, 4 Aug 2006 23:27:38 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Steinar H. Gunderson" <sgunderson@...foot.com>
Cc:	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>
Subject: Re: Suspend on Dell D420

On Friday 04 August 2006 18:23, Steinar H. Gunderson wrote:
> [Please Cc me on any followups]
> 
> Hi,
> 
> Suspend-to-RAM works fine on my new Dell Latitude D420 (with Core Duo) in
> 2.6.16, but it broke in 2.6.17 -- the machine suspends just fine, but when it
> resumes, the disk never spins up, the screen stays black and it just hangs.
> Bisecting shows that the following commit is where it broke:
> 
> commit 78eef01b0fae087c5fadbd85dd4fe2918c3a015f
> Author: Andrew Morton <akpm@...l.org>
> Date:   Wed Mar 22 00:08:16 2006 -0800
>  
>     [PATCH] on_each_cpu(): disable local interrupts
>  
>     When on_each_cpu() runs the callback on other CPUs, it runs with local
>     interrupts disabled.  So we should run the function with local interrupts
>     disabled on this CPU, too.
>  
>     And do the same for UP, so the callback is run in the same environment on both
>     UP and SMP.  (strictly it should do preempt_disable() too, but I think
>     local_irq_disable is sufficiently equivalent).
>  
>     Also uninlines on_each_cpu().  softirq.c was the most appropriate file I could
>     find, but it doesn't seem to justify creating a new file.
>  
>     Oh, and fix up that comment over (under?) x86's smp_call_function().  It
>     drives me nuts.
> 
> Applying the patch in reverse against 2.6.17 (it doesn't apply cleanly, but
> I've done what seems to be the moral equivalent) makes the suspend work
> again.
> 
> Any ideas? It does not work with the latest git checkout as of today.

I guess the patch may interfere with the CPU hotplug badly.  Could you please
check if you can take CPU1 offline/online?

Rafael
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