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

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Message-ID: <d120d5000703280624q62c26ffbs80e31d557bf3c72b@mail.gmail.com>
Date:	Wed, 28 Mar 2007 09:24:06 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Jiri Kosina" <jikos@...os.cz>
Cc:	"Thomas Meyer" <thomas@...3r.de>, "Jiri Kosina" <jkosina@...e.cz>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Adrian Bunk" <bunk@...sta.de>,
	"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 Tue, 27 Mar 2007, Thomas Meyer wrote:
>
> > It seems, that after the resume all usb devices gets removed and plug in
> > again (virtually!). This results in a new input device name:
>
> Yes, this is what actually happens. JFYI see current thread on lkml which
> is a bit realted - http://lkml.org/lkml/2007/3/27/149 if interested.
>
> > This change confuses the X synaptics driver:
> > Touchpad no synaptics event device found (checked 11 nodes)
> > Touchpad The /dev/input/event* device nodes seem to be missing
> > (EE) xf86OpenSerial: Cannot open device /dev/input/event2
> >         No such file or directory.
> > (WW) Touchpad: cannot open input device
> > One could say that the synaptics driver rightly complains about the
> > missing event2 device! So is this a bug in the X synaptics driver?
>
> You can of course work this around by adding an udev rule such as
>
> SUBSYSTEM=="input",KERNEL=="event*",SYSFS{name}=="appletouch",SYMLINK+="input/appletouchpad"
>
> and the let Xorg use /dev/input/appletouchpad, which will always be a
> symlink to the correct device.
>

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.

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?

-- 
Dmitry
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