Problems with ACPI And My PS2 Mouse!!

[Brian Black]

hey,
    I recently installed 5.1R and after boot up, with acpi enabled, my 
mouse begins to work incorrectly.  when i move the mouse it disappears 
and reappears elsewhere when i stop..  Whats Wrong???  When i disable 
acpi from boot up the problems goes away??  But i cant disable this 
because i need to make use of my usb ports??  I have a Soyo KT333 dragon 
lite motherboard if that helps.  i guess from what i hear that the 
problem might be with the board( I hope not because it cost a lot of 
money ;-)) .   Could someone shed some light on this problem for me.   TIA