I've had success in working around the ehci-hcd error by recompiling the
kernel WITH power management (CONFIG_PM=y) but WITHOUT ACPI support
(CONFIG_ACPI not set).  With this done, EHCI seems to be behaving... at
the very least, it's not flooding my syslogs with "new high-speed USB
device" messages and isn't squawking over a couple of large file
transfers I'm doing right now.

That won't help those of you who depend on ACPI for power management,
but...

(This is with kernel 2.6.23.1 under Gutsy.)

-- 
ehci_hcd module causes I/O errors in USB 2.0 devices
https://bugs.launchpad.net/bugs/88746
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