Hi,

I have got Libretto L3. I also have same problem.
Next patch seems fixed USB problem.After I applied it,
USB mouse works with X.

I think next patch is adhoc.
How about trying next patch?

Regards
---
 Masanori Kanaoka	kanaoka@ann.hi-ho.ne.jp

Index: sys/arch/i386/pci/pci_intr_fixup.c
===================================================================
RCS file: /ftp/cvs/syssrc/sys/arch/i386/pci/pci_intr_fixup.c,v
retrieving revision 1.19
diff -u -r1.19 pci_intr_fixup.c
--- sys/arch/i386/pci/pci_intr_fixup.c	2001/12/07 08:07:57	1.19
+++ sys/arch/i386/pci/pci_intr_fixup.c	2002/04/21 06:32:24
@@ -442,6 +442,16 @@
 #endif
 			continue;
 		}
+
+		/* for Libretto L2/L3 USB hack */
+		if (l->clink == 6) {
+			l->irq = 7;
+			pciirq |= 1 << l->irq;
+			printf("pciitr_link_fixup: PIRQ 0x%02x already "
+			   "connected to IRQ %d\n", l->clink, l->irq);
+			continue; 
+		}
+
 		/*
 		 * Interrupt isn't connected.  Attempt to assign it to an IRQ.
 		 */