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

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Date:	Wed, 28 Mar 2007 18:51:52 +0200
From:	Thomas Meyer <thomas@...3r.de>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Jiri Kosina <jikos@...os.cz>, 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

Dmitry Torokhov schrieb:
> 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.
>>
This was my first idea, too. But then i found this entry in the
Changelog of the synaptics driver:

- In the DeviceOn() function, if opening the device node fails, try to
  auto-detect the correct event device again. This fixes some problems
  which occur after a suspend/resume cycle or after rmmod/insmod-ing
  the psmouse kernel driver.

>
> 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?
>

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