Strange bug with mouse wheel scrolling

Greg Stark gsstark at
Tue Apr 11 11:50:23 PDT 2006

Matthias Hopf <mhopf at> writes:

> On Mar 31, 06 00:00:55 -0500, Greg Stark wrote:
> > I have a bug here but I'm not sure if it's an X bug or a Linux kernel bug or
> > perhaps my mouse having some weird hardware failure, though it's never done it
> > before. 
> > 
> > Whenever I scroll (vertically) by quickly spinning the mouse wheel it inserts
> > the occasional horizontal scroll. Checking with xev it does in fact send the
> > occasional "button 7" event:
> See
> I didn't have time so far to investigate this further, but your input
> about your mouse model could help here.

I'm not sure why it's in novell's bugzilla, should I register and comment
there or just report it to x's bugzilla?

That particular entry seems pretty enenlightening. It shows numerous people
reporting the problem and nobody actually making any progress tracking down
the source.

In fact if I do cat -A /dev/input/mouse0 I see no unusual events. So I very
much doubt this is a hardware issue.


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