Mouse cursor jumping around

Discussion in 'iMac' started by Remis, Sep 21, 2008.

  1. Remis macrumors newbie

    Oct 27, 2007

    The mouse cursor on my iMac has a weird habit of jumping around. Eg, I'll be about to close a window, and then the cursor will suddenly jump to the bottom of the screen.

    This happens with both my Mighty Mouse, and a Microsoft one...

    Any ideas...?:confused:
  2. celavato macrumors regular

    Oct 6, 2005
    It's a known Mighty Mouse issue. I can't help you with the Microsoft mouse.
  3. KonaBlend macrumors newbie

    Oct 18, 2008
    So I'm not the only one who's noticed this; using mighty mouse or logitech G5.

    It seems to me there is a flaw in how acceleration is applied because the jumping is lessened as the acceleration factor is turned down. Just a guess, but there might be issues of how acceleration is applied in light of the queued mouse event model.

    Would be nice if we could turn off acceleration completely and discretely adjust mouse sensitivity. Apple's mouse acceleration curve is ghastly.
  4. Cave Man macrumors 604

    Cave Man

    Feb 12, 2007
    Neander Valley, Germany; just outside Duesseldorf
    This is a long-standing bug in the OS X USB driver.
  5. mrsir2009 macrumors 604


    Sep 17, 2009
    Melbourne, Australia
  6. dgilchri macrumors newbie

    Aug 18, 2009
    Jumping Mouse cursor

    Thank you caveman - it HAS to be a bug in the OSX usb drivers - but what amazes me is the huge volume of reports of this issue and yet nobody has a solution that works. I have had an open thread on this in the Apple discussion forums for over a year - "unresolved" !!

    Please, Apple, can we have a fix ? - my daughter's iMac is unusable !!
  7. someguy macrumors 68020


    Dec 4, 2005
    Still here.
    What surface is your mouse used on? Reflective surfaces can cause optical mice to behave wildly.

    I would recommend trying a few different type mouse pads and see how they affect this issue.

    Same goes for you, dgilchri. I've had this happen once or twice over the past few years, but I'd be willing to bet that if her iMac is truly unusable because of this issue, the cause may be something other than a bug in the driver.
  8. joudbren macrumors regular

    Apr 13, 2007
    Edmonton, Alberta, Canada
    I was having the same issue with my Logitech USB laser mouse on my i5 recently. The jumpy cursor seemed to pop up after I installed a Spyder3 USB screen calibrator. Turned out that was just a coincidence.

    In my case I did a permissions repair in Disk Utility and the jumping cursor was gone! Can't guarantee it will work for you but at least worth a try. Cheers!

  9. norman21 macrumors newbie

    May 5, 2009
    Turn off AirPort

    Turning off AirPort worked for me; maybe if the AirPort were actually being used, it would not have time to confuse the cursor. As it is, I can use ethernet port.

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