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My computer has three video cards, six monitors, and (believe it or not) a mouse.

Generally, all six outputs display the correct mouse cursor. Occasionally, the outputs on a random video card will display a vertical series of dots or a 64x64 grid of dots. But when I move the mouse so the cursor switches to another type (i.e. to enter text or resize a window), sometimes it will display correctly. Other times it will display a different series of dots.

If I move the mouse cursor back and forth between outputs of different cards, it changes back to normal after 30 to 50 back-and-forth gestures.

  • I've ruled out a defective card, as it's happened on two Radeon X1650s and two Radeon HD4670s.
  • I've ruled out the driver as I've used three different versions and the Windows generic video driver.

Why does this happen? How can I fix it?

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  • Have you tried disabling the hardware cursor?
    – Borealid
    Commented Aug 8, 2010 at 3:30
  • 1
    No... I don't see that option in the mouse control panel; where is that?
    – tsilb
    Commented Aug 8, 2010 at 3:39
  • 5
    +1 for explaining why you ruled out certain error sources.
    – Torben Gundtofte-Bruun
    Commented Aug 8, 2010 at 7:03
  • What IS are you running? Windows 7? XP?
    – David Markle
    Commented Aug 9, 2010 at 11:50
  • @David: My OS is Windows 7 Ultimate.
    – tsilb
    Commented Aug 9, 2010 at 20:59

1 Answer 1

Reset to default
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In addition to the above comment suggestions:

  • does this happen when DWM is disabled?

In other words, switching to Aero Basic un-hardware accelerated desktop.

This is somewhat endemic to all Radeon cards under some conditions. I have three monitors hooked up to a single Radeon 58xx series card and I've seen it -- but it is extremely rare. And I can't recall seeing it in a while.

Also I found a video documenting the Radeon pointer corruption and uploaded it to youtube. Does it look like this?

http://www.youtube.com/watch?v=iP7HMIJkbKk&hd=1

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  • Yep, that's it. Interesting it only happens on the screens on one card at a time when the other cards are on the same driver.
    – tsilb
    Commented Nov 7, 2010 at 18:52

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