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

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Date:	Wed, 28 Mar 2007 14:26:31 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Thomas Meyer <thomas@...3r.de>
cc:	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
Subject: Re: appletouch quirk doesn't run at resume

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.

-- 
Jiri Kosina
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