I am experiencing this issue too:
$ sudo dmidecode -s system-product-name
MacBookPro5,2
$ lsb_release -r
Release:11.04
I have tried everything previously discussed in the comments. The only
thing that works reliably is making sure that I boot OS X and then
restart to Linux.
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You
This is still a problem in Hardy Beta for me. I'm using a Macbook and a
bluetooth mouse.
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[Feisty[mouseemu]Freeze of usb mouse while using keyboard
https://bugs.launchpad.net/bugs/113344
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