Mouse Movement Problem

Hi!

I have one Mac Pro Quad Core Nehalem 2.66Ghz with one ATI 4870 connected to two Acer Al2423 (1920x1200 at 60 Hz). One is connected using DVI cable and the other with the adapter Mini display port/DVI.

The problem here is the mouse movement, if you try to follow a straight line with the mouse (mighty mouse) the pointer jumps forward some times more rapidly than your hand movement. Imagine you want to select one button in some software and when you stop the mouse to click that button the pointer stops some inches after or behind... i'm getting nut with this thing.

Apple on the phone can fix this thing... tried lot's of thing's: change ports, connect/disconnect, new OSX install (10.5.6) the 10.5.8 don't change nothing at all... with one monitor connected on the the DVI port or using only the Mini Display Port...

I have BootCamp installed with Vista Ultimate and the mouse works very nice there but in OSX just jumps and moves erratically.

I visited a technical Apple center this morning and they didn't find any problem, i tested the machine with them and the mouse was very fine, not a single jump, using my keyboard and mouse and others in the center...

What can i do to solve this thing?

I found in one forum a message that someone had a problem with two monitor's creating some mouse lag update in OSX but in this case works fine in BootCamp, so, isn't hardware problem... presuming, from a logical thought!

Regards,
Murdock

p.s. - i'm freaking out (((((((((((

Hi me, the real me... nice talk to myself.

Change cables, using VGA adapters and the problem goes away... bad drivers from Apple/ATI.

Snow Leopard will resolve this?

Someone knows more tips from this?

Regards

Hi!

Thank's for your time but the problem here isn't mouse.
With BootCamp and Vista the mouse works great, so, mouse is fine...

The problem is Drivers/Mini Display Port/DVI.

The only thing that i need to confirm:

More people with this problem in other different machines?

Like 2.93Ghz? Eight Core 2.26Ghz?

With the Nvidia GT 120 card happens the same thing?

Regards

People, read the thing...

No mouse problem, reboot don't fix anything; this happens when you have a connection with DVI cable or with Minidisplay adapter, when you change to VGA adapter the problem stops.

Big problems with 4870 and DVI/Minidisplay ports.

Apple engineers know the issue but Snow Leopard don't fix anything.

More people with this thing in different machines?

Regards

Hi!

When you connect more cards and monitors the jumps occurs in all monitors; it seems that the problem occurs in more than the ATI drivers is embed in the system and the Snow Leopard dont solve this problem, tested by myself and other users with the same problem.

I found information reporting that the HDCP protocol is in some level interfering to with the drivers on the OSX.

The Xserve has this problem to. One friend of mine report some problems using Final Cut Pro with the Xserve machine and the Graphic Card isnt ATI is NVIDIA GT 120. Some users with Mac Pro report the same problem in FCP.

I think we need to make a new Thread here with a list that reports Monitor models and Mac Pros systems having this annoying thing

Can you confirm if the monitors that you use are HDCP compatible?

Another hot topic, with the Apple Cinema Display this occurs?



Regards

Hi!

HDCP protocol works in DVI or HDMI.

What Praha told us is a tremendous valuable information:

The 24 Led Display (only Mini Display Port) dont affect the mouse movement.

Praha, when you only have the 23 Display connect to the DVI port the mouse has the same problem?

Regards

Hi!

One link that Praha give has this information:

Both OEM and PC flashed cards have the same problem, depending on monitors, of course.

I will investigate this thing related to HDCP:

The AppleUpstreamUserClient.ktext, ona a Hackintosh if you use a Disabler.ktext with it in its blacklist the jumping/mouse lag problem goes away.

If anyone knows how this thing works can give us a help?

Regards

Hi!

This problem only fix the mouse trouble with NVIDIA cards... in this case this a no solution but is revealing how far the things have come
Apple is starting to losing points in some departments isnt the same like Macintosh Classic (my first Mac, was from my father), the Quadra 900 and the G4.

Still trying to fix this thing.

Strange thing happen today when i started the computer. Look how the boxes from the screen adjustment are???

http://img181.imageshack.us/i/24299195.jpg/

http://img134.imageshack.us/i/74092029.jpg/

Connect to the same problem?

Regards