MacbookPro4,1: stuttering keyboard, freezing mouse

[produnis]

Hi folks, the problem I am describing here occured in Jaunty (fresh install, no PPAs) and now occures in Karmic beta (fresh install, no PPAs), which I installed on my MacbookPro4,1

The Problem:
In random time, the keyboard and mouse seem to hang for about 5 Seconds. During that time, the mouse freezes and there is no response from the keyboard (by the way: It does not matter if I plug in an external usb-mouse or usb-keyboard).

After this 5 seconds, I am able to hit some keys again, but it looks as if CapsLock is activatet (but it is not). If I am writing a text while the problem comes up, some of the following letters are cAPiTaliZED (<-- like I did there) and some are not...

After freezing for 2-4 times, everything is fine again for hours.
I cannot say that this problem is connected to a specific software or task I am working on...
... it occures whenever it "wants" to do... no matter which software is active...

Does anyone face(d) the same problem?
Does anyone have a workaround?
:)

greetz,
Produnis

[Salohcin]

When you say:

(by the way: It does not matter if I plug in an external usb-mouse or usb-keyboard).

does this mean the external keyboard/mouse doesn't work either? Might be a stupid question, but i found on my mbp4,1 that i had an almost identical problem to you, but it was due to the mac hardware.

There's a ribbon cable that comes from the keyboard/mouse logic that is pinched internally, and pressure on the battery can make the connection fail on and off. I had to get it repaired by apple.

On the other hand, if it doesn't work with external keyboard and mouse, then it probably isn't the hardware, and is software based. Hope this helped. Good luck figuring it out.