Bug#465220: xserver-xorg: External mouse button events are doubled up

[Brice Goglin <Brice.Goglin@ens-lyon.org>]

Sam Morris wrote:
> Package: xserver-xorg
> Version: 1:7.3+10
> Severity: normal
>
> When I try to use an external mouse I notice that all the button events
> occur twice in quick succession:
>   

What kind of external mouse it this? USB? PS2?

We've seen lots of bug reports like this that were caused by
/dev/input/mice "containing" /dev/psaux or so. In such a case, all
events are received by both the input section using /dev/input/mice (the
default one) and some other section whose device file in included in the
former, hence the double events that you see.

Brice