linux-kernel - Re: 2.6.21-rc2 regression vs. 2.6.20: AT keyboard only works with pci=noacpi

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Date:	Wed, 7 Mar 2007 21:25:34 +0000
From:	Ash Milsted <thatistosayiseenem@...ab.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-acpi@...r.kernel.org, torvalds@...ux-foundation.org,
	dmitry.torokhov@...il.com
Subject: Re: 2.6.21-rc2 regression vs. 2.6.20: AT keyboard only works with
 pci=noacpi

On Wed, 7 Mar 2007 12:00:04 +0000
Ash Milsted <thatistosayiseenem@...ab.com> wrote:

> On Sun, 4 Mar 2007 14:23:50 +0000
> Ash Milsted <thatistosayiseenem@...ab.com> wrote:
> 
> > On Sat, 3 Mar 2007 15:14:24 +0000
> > Ash Milsted <thatistosayiseenem@...ab.com> wrote:
> > 
> > > Hi,
> > > With 2.6.21-rc2-git1 I have a problem with my ps/2 port keyboard - it only works
> > > with one of the following on the command-line:
> > >  - nolapic
> > >  - irqfixup
> > >  - pci=noacpi
> > > Otherwise it gets stuck with the numlock on.
> > > The following options have no effect:
> > >  - nohz=off (who knows eh?)
> > >  - pci=nomsi
> > > 
> snip
> > > 
> > > Ash
> > 
> > Just checked 2.6.21-rc2-mm1, still has the problem.
> > Also, acpi=noirq fixes it too.
> > To clarify, the problem is that my ps/2 port keyboard is completely frozen
> > on boot - usually it gets activated when udev probes for hardware (my kernel
> > config is highly modular). It worked fine with 2.6.20 and earlier with acpi 
> > taking care of interrupt routing.
> > 
> > Ash
> 
> Any thoughts on this? It still occurs with 2.6.21-rc3. Here's my config
> in case that helps. You'll see that I have swap-prefetch patched in (I
> also have RDSL and some VM changes in there), but I have confirmed that
> the problem occurs with no extra patches. By the way, I tested mm1 with
> a rather different config (I used my distro package) and still saw the
> problem.
> 
> Also, you should probably ignore that bit above where I suggest the
> keyboard driver is being loaded as a module, because of course it
> isn't.. Yet it does start responding (with pci=noacpi) at about that
> time that udev does its thing.
> 
schnip

So, I tracked this down to 2.6.21-git7, the first snapshot that gives me
this problem. Tellingly it does contain an input tree merge. I would git bisect
but I don't have a local copy of the tree - I tried to get one, but it stopped
halfway through the clone, probably because I had to use http... So, I hope that
helps.

Ash

PS: I should have said I'm not subscribed, so please CC me on reply.
PPS: That almost rhymes. Almost.
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