linux-kernel - Re: appletouch quirk doesn't run at resume

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Date:	Wed, 28 Mar 2007 13:35:25 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Jiri Kosina" <jikos@...os.cz>
Cc:	"Thomas Meyer" <thomas@...3r.de>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Soeren Sonnenburg" <kernel@....de>,
	linux-input@...ey.karlin.mff.cuni.cz,
	"Peter Osterlund" <petero2@...ia.com>
Subject: Re: appletouch quirk doesn't run at resume

On 3/28/07, Jiri Kosina <jikos@...os.cz> wrote:
> On Wed, 28 Mar 2007, Thomas Meyer wrote:
>
> > > I am not sure if this would help... According to the excerpt from X
> > > log synaptics driver attempted to scan evdev devices and locate the
> > > touchpad. However if this scan happen before udev had a chance to
> > > process the event and create new /dev/input/eventX device node it will
> > > fail.
> > Okay. This strengthens above statement. And udev is too slow to create
> > the devices, while the driver already scanned the directory.
> > > I wonder if we should adjust the X driver to spin for a couple of
> > > seconds in EventAutoDevProbe if the touchpad was already seen once...
> > > Peter?
>
> Yes, it looks like this is the root cause.
>
> However I must admit that I don't like this behavior too much. We
> shouldn't rely on drivers individual userland to wait for a reasonable
> time before the udev settles down. This is not a nice API to provide. Will
> try to think of some solution which would have reasonable
> nastiness/functionality ratio.
>

The proper fix would be teach X to recognize hotplug events. I've
heard  they are working on it.

-- 
Dmitry
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