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I have a strange issue with a dual monitor, extended desktop setup where the mouse is always fine on the primary monitor, but sometimes when I move to the secondary display the icon becomes garbled and distorted (sometimes it just looks like a vertical line, instead of a pointer). If I move the mouse back and forth rapidly between primary and secondary displays the level of "garbledness" of the icon will change and sometimes go away completely. If I switch the display settings and set it to "Duplicate Monitor 1" then I end up with a garbled icon on the primary display and an accurate one on the secondary. Very annoying.

Computer is Windows 7 Ultimate with an HD5780 and the newest video drivers. Monitors are two Dell 24" displays connected via DVI cables. I have also tried VGA cables.

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I have a similar issue (same OS, gfx-card and screens) which randomly comes and goes, except in my case its not just the mouse pointer that's garbled. –  glenneroo Jan 28 '11 at 17:14
    
@glenneroo Where else are you seeing this behavior? –  Nathan Taylor Jan 28 '11 at 17:22
    
My entire 2nd display. It's most noticeable with text - it seems like text is stretched/shrunken making it somewhat strenuous to read. –  glenneroo Jan 28 '11 at 17:27
    
@glenneroo This sounds a little different than what I am experiencing, but could be relevant just the same. So far, ATI/AMD has ignored my bug reports. –  Nathan Taylor Feb 1 '11 at 17:35
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What happens if you leave the settings as is and then switch which monitor is plugged into which output; then you can rule out if it is a Computer-software/hardware or monitor-hardware issue. You could try uninstalling the drivers and doing a clean reinstall. Also check with the computermanufacturer/ Dell monitor to see if there is a known issue/ and Microsoft to see if there is a Win7 bug?! –  Iceking007 Feb 18 '11 at 14:52

6 Answers 6

up vote 8 down vote accepted

The problem is unfortunately an old bug with ATI cards under some multi-monitor setups that is being reported since at least 2009. I experienced it with an HD 4770. It was particularly recurring when I would host a virtual machine in fullscreen mode on my secondary monitor. But would also happen without it when I moved between screens. Just not so often.

There's no known fix at this time, Nathan. There's however a workaround:

If you enable mouse pointer trails, the corruption will go away.

  1. In your Windows 7 go to Control Panel -> Mouse -> Pointer Options Tab
  2. Enable Pointer Trails.
  3. If you don't like the effect, move the slider all the way to the left. This will make the trailing effect all but disappear.

That's it. The mouse corruption will "not" happen again. The constant redrawing of the mouse trails is effectively hiding the bug from view.

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Workaround: Try to enable pointer shadow (apply settings), and then disable it (apply settings). The mouse pointer should be fixed.

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I was able to immediately remove the corruption by opening my desktop -> screen resolution control panel and adjusting my side monitor's position, accepting changes, then moving it back to where it was and saving changes again. The process of recycling the display shook the garble off the cursor for me.

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I'll add my workaround to the mix here, since they all suck a little. I've fixed the problem each time by moving the mouse to the top-right or bottom-right corner of the screen. I think by getting the mouse completely off screen, it's forcing the problem to resolve itself.

I'm using Windows 8.1 and have an AMD 7870.

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Having had the same issue with AMD FX-8350 / CLUB 3D RADEON HD 7870 ROYAL KING. The cursor will randomly become distorted on 2nd display. The only workaround I have found, apart from the mouse trail one, is:

Create Monitor Group in Catalyst (you now have ''1 monitor'' with an effective res. of 3840x1080) (if u use full HDs) and keep Vert. Sync on. Problem gone.

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I had this problem, too, my mouse pointer sometimes looked very trashy, like I have serious memory or display driver problems. Windows 7, dual screen, Vmware, integrated Intel display adapter, HP desktop PC. I don't think this problem is connected to any specific hardware component. The problem is with Windows and VMware, but I believe it's only in dual screen mode. Hardware doesn't matter.

My solution: Control Panel / Change how the mouse pointer looks = Mouse Properties then go to Pointer Options tab, check Display pointer trails. This is going to make the movement of your mouse pointer crazy I know, but now slide to the trail delay to the shortest. (slide it to the left)

After setting the above options my mouse pointer started to behave normally, and the the cursor distortion has gone forever! (After two PCs and two weeks I am almost sure actually) (After applying these new settings perhaps you will need to change the pointer look once)

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