System hangs during boot when usb printer is plugged in

["Stathis Kamperis" <ekamperi%gmail.com@localhost>]

Greetings everyone.

Whenever I plug in my usb printer (HP Deskjet F2180), the system hangs
during boot just after some ehci related messages are printed, eg

ehci0 at pci0 dev 3 function 3: Silicon Integrated System 7002 USB 2.0
host controller (rev. 0x00)
ehci0: interrupting at ioapic0 pin 23, event channel 9
ehci0: EHCI version 1.0
ehci0: companion controllers, 2 ports each: ohci0 ohci1 ohci2
usb3 at ehci0: USB revision 2.0
ehci0: handing over full speed device on port 1 to ohci0
[hang]

If I unplug the printer and then boot, everything works alright.

I am using NetBSD-4.99.72/i386. The printer used to work with NetBSD 4.
What is worth mentioning is that NetBSD-4.99.72/XEN0 works like a charm. See:

[stathis@netbsd ~] uname -a
NetBSD netbsd 4.99.72 NetBSD 4.99.72 (XEN3_DOM0) #0: Fri Aug 29
23:49:07 EEST 2008
root@netbsd:/usr/obj/sys/arch/i386/compile/XEN3_DOM0 i386
[stathis@netbsd ~] dmesg | grep ulpt
ulpt0 at uhub0 port 1 configuration 1 interface 1
ulpt0: HP Deskjet F2100 series, rev 2.00/1.00, addr 2, iclass 7/1
ulpt0: using bi-directional mode
[stathis@netbsd ~]

Any hints on how to proceed ?

Best regards,
Stathis Kamperis