[Bug 1752] New: Mouse clicking has slight delay

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https://freedesktop.org/bugzilla/show_bug.cgi?id=1752        
   
           Summary: Mouse clicking has slight delay
           Product: xorg
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: Input/Mouse
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: gbin-freedesktop at gootz.net


Basically, if I make a "click and drag" gesture 
(selection box, move a window, select a part of a text... ) 
with my mouse there's a very slight delay before it starts drawing the box.

So far what I found :

- It does not happen under win XP
- I tried under KDE and GNOME, it is the same behaviour
- I tried to tweak X11 parameters for my Logitech Trackman marble [ Option
"Resolution", Option "SampleRate", Option "BaudRate" ], same behaviour
- I switched to a standard USB mouse, same behaviour.

When you click AND move the mouse it seems that the "mouse down" event is taken
into account at the next mouse point instead of current one or it has been
bufferize in some way.

For every "click and move" gesture it is annoying : you put your pointer on an
area, click and move quickly and the system click outside the area (button,
window, widget ...)

Each time you click you have to press "hard" = "with a slight pause" the left
button in order to be sure to have a correct GUI response.

I continued to investigate...

Nothing changed when :

- I tried a quick sampling mouse patch
- I switched from 64bits to 32bits kernel.
- I switched for an usb mouse
- I tried on another completely different computer with a totally different mouse
- A friend saw the defect and reproduced it on Cygwin (!) with Xfree86

So it appears that it is not a problem of linux or mouse related pb but
definitively an X problem.        
   
   
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