Why does USB lock up my system with the Intel Providence PR440FX motherboard?

In short it’s because the BIOS routes IRQ lines incorrectly in IO-APIC mode. ┬áDisable IO-APIC mode if you want to use the onboard USB on a PR440FX motherboard.

See the following links.

http://www.mail-archive.com/linux-usb-users@lists.sourceforge.net/msg00850.html

http://forums.2cpu.com/showthread.php?threadid=6697

http://lists.freebsd.org/pipermail/freebsd-current/2005-October/057441.html

http://arstechnica.com/civis/viewtopic.php?f=8&t=985056

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