On Thu, 21 Mar 2002, Ben Logan wrote:

> On Thu, Mar 21, 2002 at 09:48:51AM -0500, Reuben D Budiardja wrote:
> > Hi
> > For some reason, my mouse pointer got offset-ed in the X windows. What I mean
> > is, when I clicked the mouse, the place that got clicked is not the place
> > pointed by the mouse pointer, but the place left (offset) to the mouse
> > pointer. This is so weird. Restarting X does not help. I tried to switch win
> > manager, and the same problem still occurs. Only reboot solve the problem
> >
> > This happens randomly. Today, it has happened 3 times. How can this happen?
> > I am running RH 7.2.
>
> What type of mouse do you have?  Is it possible that the protocol you
> are using isn't quite right for the mouse?  If so, perhaps it screws
> the mouse up until its power is cut.  That may be a totaly rediculous
> idea--I don't know if it's even possible with mouse circuitry.  I know
> that I have some USB devices that will sometimes get screwed up and I
> have to either shut the power to the computer off or unplug the
> devices in order to fix them.
>
> Do you have similar problems at the console?  If it is solely an X
> problem, do you have the latest XFree86 updates?

Something escapes me here.  How could this be anything but a software
problem?  The mouse hasn't a clue where on the screen the cursor is
positioned.  It's the mouse device driver that maintains the coordinates
of the cursor position; the mouse can only say "move this much + or - X,
and + or - Y."  When the mouse is clicked, the only thing the mouse sends
is "button B is pressed," and it's up to the mouse driver to associate
that event with the last location it knew.

Where the opportunity for error lies seems to me to be between the mouse
driver and the display, if the cursor is actually drawn at a spot slightly
different than the location the mouse driver believed it was drawn.  Then
the viewer (I) will have a different idea of the location of the cursor
than the mouse driver.

Even though I believe it's a software problem, I haven't any idea why the
problem should occur only sometimes.  I just think the hardware should be
ruled out as a culprit.

Jim Cunning



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