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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?

share|improve this question
Have you tried disabling the hardware cursor? – Borealid Aug 8 '10 at 3:30
No... I don't see that option in the mouse control panel; where is that? – tsilb Aug 8 '10 at 3:39
+1 for explaining why you ruled out certain error sources. – Torben Gundtofte-Bruun Aug 8 '10 at 7:03
What IS are you running? Windows 7? XP? – David Markle Aug 9 '10 at 11:50
@David: My OS is Windows 7 Ultimate. – tsilb Aug 9 '10 at 20:59
up vote 3 down vote accepted

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?

share|improve this answer
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 Nov 7 '10 at 18:52

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