If you have a non-operating HP5300C or HP5370C USB scanner with a UHCI based
system, Intel or Via chipsets, there is a new kernel patch available. See
http://qa.mandriva.com/show_bug.cgi?id=26728#c41

The patch has been tested in 2007.0 with vanilla 2.6.20. If you prefer to
wait it should be in kernels starting with 2.6.21. Have fun :-)