linux-kernel - Re: sleep/fan problem bisected to 73201dbec64aebf6b0dca855b523f437972dc7bb

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Date:	Fri, 12 Apr 2013 17:18:05 -0600
From:	Jake Edge <jake@....net>
To:	Jake Edge <jake@....net>
Cc:	hpa@...ux.intel.com, rjw@...k.pl, linux-kernel@...r.kernel.org
Subject: Re: sleep/fan problem bisected to
 73201dbec64aebf6b0dca855b523f437972dc7bb

On Fri, 12 Apr 2013 12:08:31 -0600 Jake Edge wrote:

> I have been having a problem on my laptop (HP Compaq 2510p) over the
> last two months with >= 3.7 kernels.  After the first resume, it turns
> on the fan and leaves it running at top speed no matter what the
> system is doing.  I finally bisected it over the last two days and
> that points the finger at your patch
> 73201dbec64aebf6b0dca855b523f437972dc7bb:
> 
>  x86, suspend: On wakeup always initialize cr4 and EFER
>     
>     We already have a flag word to indicate the existence of
>  MISC_ENABLES, so use the same flag word to indicate existence of cr4
>  and EFER, and always restore them if they exist.  That way if
>  something passes a nonzero value when the value *should* be zero, we
>  will still initialize it.
> 
> I should note that the bisection (between 3.6, which works, and 3.7,
> which doesn't) did not exhibit the same symptoms as I see with any 3.7
> or 3.8 kernel (either from Fedora or built myself), but would instead
> refuse to come out of sleep (but still have the fan running at top
> speed) ... so maybe I've really bisected the "fails to come out of
> sleep" problem, rather than the "fan runs at top speed after resume"
> problem, dunno ... 

As you've undoubtedly surmised, I was in fact tracking down the resume
failure which was caused by the above and fixed by another of your
patches: 1396adc3c2bdc556d4cdd1cf107aa0b6d59fbb1e ... neither of which
were related to the fan issue as far as I can tell ... now I am off
bisecting while applying those ...

sorry for the noise ...

jake

-- 
Jake Edge - LWN - jake@....net - http://lwn.net
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