Re: [PATCH]: Add command-line option to i8042 to completely disable it

From: Vojtech Pavlik
Date: Wed Jul 25 2007 - 04:04:15 EST


On Wed, Jul 25, 2007 at 12:05:04AM -0700, Andrew Morton wrote:
> On Mon, 23 Jul 2007 13:05:22 -0400 Chris Lalancette <clalance@xxxxxxxxxx> wrote:
>
> > (I tried to send this patch to linux-input@, but it seems to be currently having
> > some problems, so I'm going directly to LKML).
> >
> > Certain (broken) pieces of South Bridge hardware will respond to
> > i8042_read_status() on boot with 0x0, despite there not being a real i8042
> > controller hooked up in the south bridge. This can cause the detection for the
> > i8042 to return a "phantom" device, which hangs up later initialization. Note
> > that using "i8042.nokbd" and/or "i8042.noaux" do not help with this, since this
> > shows up during i8042_controller_check() (before either of those options are
> > checked). This patch adds a command-line option "i8042.disable", which just
> > completely disables any checking for the i8042 controller.
>
> That's an unfortunate fix. Is there really no way in which we
> can auto-detect such a situation without requiring a manual
> setting?

The fact that the current detection hangs suggests that the scenario is
possible to detect.

--
Vojtech Pavlik
Director SuSE Labs
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