Bug#506430: Mouse double click bug related to CorePointer and ServerLayout directives

[roland65@free.fr]

Package: xserver-xorg
Version: 1:7.3+18
Distribution: Debian Lenny

Hi,
since I had problem to let my Wacom Volito2 pen tablet work correctly on Debian
Lenny, I investigated the xorg.conf options and I found the following issue, not
related to my tablet problems. So, we only consider here the case where there is
a single input device :

- the simple xorg.conf file generated by 'dpkg-reconfigure xserver-xorg' has no
ServerLayout section and no Corepointer option in the mouse section. In this
case, the mouse works well. The mouse section is :

Section "InputDevice"
        Identifier        "Configured Mouse"
        Driver                "mouse"
EndSection


- however, if I add a simple ServerLayout section (this is required to work with
a pen tablet), like this one :

Section "ServerLayout"
        Identifier        "Default Layout"
        Screen                "Default Screen"
        InputDevice        "Generic Keyboard"
        InputDevice        "Configured Mouse"
EndSection

then, the mouse doesn't work anymore. Single clicks events are seen as double
click events and the mouse is not usable at all.

However, if I add a CorePointer option to the mouse section, like this :

Section "InputDevice"
        Identifier        "Configured Mouse"
        Option                "CorePointer"
        Driver                "mouse"
EndSection

together with the above ServerLayout section, then the mouse works well again.

I've seen some bugs report that deal with the double click problem, but perhaps
my explanation could help to clarify things and fix the bug before the release
of Debian Lenny.

Best regards,
RB