linux-kernel - Re: Debugging Thinkpad T430s occasional suspend failure.

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Date:	Tue, 12 Feb 2013 21:37:27 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Dave Jones <davej@...hat.com>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Debugging Thinkpad T430s occasional suspend failure.

On Tue, 12 Feb 2013, Dave Jones wrote:
> On Tue, Feb 12, 2013 at 04:56:55PM -0800, Hugh Dickins wrote:
>  
>  > > so I can hit this pretty quickly with this..
>  > > 
>  > > while [ 1 ];
>  > > do
>  > >  rtcwake -s 5 -m no ; pm-suspend
>  > > done
>  > > 
>  > > Which should make it bisectable at least..
>  > 
>  > Thanks, I'll give that a try this evening.
>  
> So uh, put a 'sleep 5' in that loop.

I had already put exactly that, to help break out when I got bored.

I'm afraid it just confirms that we have different problems: that
script gives me no trouble.  Perhaps it would give me trouble if the
timeout went up from 5 seconds to 10 hours (it does not at 10 minutes),
but that doesn't feel like a very useful line of enquiry.

I think for the moment I'm going to hope that under the surface our
problems are related, and when your bisection points a finger, look
around to see if it suggests anything for my case.  Lazy, but...

Hugh

> 
> Turns out that the firmware on my Thinkpad craps itself when it tries to suspend while
> the cpu fan is still spinning back up, and eventually it gets in a state (on a 'good' boot)
> where the fan is stuck in the 'off' state.
> 
> Result: hot laptop, machine check exceptions, and then a nice
> "CPU FAN ERROR" message from the BIOS on next reboot.
> 
> Full marks Lenovo.
> 
> 	Dave
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