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From: Stefan Ehmann <shoesoft@gmx.net>
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Date: Fri, 2 Mar 2007 16:19:32 +0100
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Subject: Re: notebook freezes
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On Thursday 01 March 2007 16:12, Stefan Ehmann wrote:
> My few days old -current freezes if I press Fn-F6 (this is the combination
> to adjust display brightness) if I've done a suspend/resume before.
> Directly after boot it works fine.
>
> This key combination normally works without any software support, so I
> don't know why it freezes the notebook.
>
> I don't know when this started exactly but I thinks it's been there for a
> few weeks at least.
>
> Any suggestions what commit could have caused this (I want to avoid binary
> search of the cvs tree if possible)?
>
> I tried with GENERIC kernel with the same result. There are no
> warnings/errors displayed on the console and I cannot even break into the
> debugger.
>
> dmesg can be found here.
> http://stud4.tuwien.ac.at/~e0125637/fbsd/dmesg

So I did a binary search.

src/sys/i386/isa/clock.c r1.231 causes my notebook to freeze.

Reverting this change in a CURRENT from today fixes the problem.

The notebook is still pingable in this state. I experienced some other random 
hangs recently but don't know yet if those are related.

Stefan