Usb Mouse Lag on Notebook Standard USB port (Suse9)

I have a Toshiba Libretto L1. USB mouse in standard port worked with 8.2 with no problems. Installed 9.0. Mouse pointer is now lagging behind movements by half a second to a second i.e. unusable. Put a USB 2.0 card in the PCMCIA slot and plugged the mouse into that. The mouse works with no problems. I need the PCMCIA slot for other things so does anybody have any ideas on solving strange behaviour? Thanks, Pieter Bruinsma Budapest