linux-kernel - Re: Fix sudden warps in mousedev

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Message-ID: <460AD556.9090408@gmail.com>
Date:	Wed, 28 Mar 2007 21:51:34 +0100
From:	Matt Keenan <tank.en.mate@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Chuck Ebbert <cebbert@...hat.com>,
	Pete Zaitcev <zaitcev@...hat.com>,
	linux-kernel@...r.kernel.org, linux-input@...ey.karlin.mff.cuni.cz,
	Peter Osterlund <petero2@...ia.com>
Subject: Re: Fix sudden warps in mousedev

Dmitry Torokhov wrote:
> On 3/27/07, Chuck Ebbert <cebbert@...hat.com> wrote:
>> Dmitry Torokhov wrote:
>> >>
>> >> And why did the mouse numbers all get rearranged in 2.6.20, e.g.
>> >> mouse1 became mouse2 for many people?
>> >
>> > Input devices are not guaranteed to be stable.
>> >
>>
>> So people with z-axis mice need to redo their X config for each
>> kernel release when the device numbers change? Or should they
>> be using some other configuration?
>>
>> People using this now have X crashes on kernel upgrade because
>> event1 became event2:
>>
>>        Driver      "evdev"
>>        Option      "Device" "/dev/input/event1"
>>
>
> I'd recommend matching on "phys" or individual capabilities bits
> instead of device node. See "man evdev".
>
I wrote a few udev rules to create specific /dev nodes for X with evedv 
(I run with multiple X users / screens / keyboards / mice on one 
machine).  I can forward you the udev rules and helper scripts if you 
want.  This means that you can hardcode the /dev nodes in your xorg.conf 
file and udev will make sure they don't move on you.  I wrote this up in 
the early days of evdev development before the phys stuff was there.

Matt
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