Re: 2.6.19-rc <-> ThinkPads

[Hugh Dickins <hugh@veritas.com>]

On Wed, 1 Nov 2006, Adrian Bunk wrote:
> 
> Subject    : Thinkpad R50p: boot fail with (lapic && on_battery)
> References : http://lkml.org/lkml/2006/10/31/333
> Submitter  : Ernst Herzberg <earny@net4u.de>
> Status     : submitter was asked to bisect
> 
> It seems to be completely unrelated (except that it's also a ThinkPad), 
> but it might be worth a try whether a (non-SMP) kernel without APIC 
> support fixes the issues after resume.
> 
> Hugh, your laptop seems to be a non-SMP laptop.

That's right.

> Do you have APIC enabled, and if yes does disabling help?

Yes, I do.  But I've just tried booting with "noapic" and with "nolapic"
and with "noapic nolapic", but none of those make any difference.

(That is, they make no difference to the FnF4-ineffective-after-resume
behaviour that I'm finding fairly easy to reproduce at will today on
2.6.19-rc4; whereas yesterday it was seeming to me that -rc4 was much
better than -rc3 in this regard.  Something I have learnt today is that
the key is ineffective "for a while", but may become effective later.
It's conceivable that the behaviour I'm reproducing today is not quite
the same as what I was experiencing earlier with real-life suspends.)

More to the point, with great hope in my heart, I've tried backing
out Andi's git-cf4c6a2f27f5db810b69dcb1da7f194489e8ff88.patch
to arch/i386/kernel/io_apic.c, the one which Michael and Linus have
homed in on.  But sadly that makes no difference for me: I'd better
get down to my own bisection.

Hugh
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