Same here on X201s (BIOS 1.12, EC 1.07, vanilla 2.6.34-rc4), but no stacktrace 
as using acpi_sleep=sci_force_enable from #532374
Reloading all usb modules (esp usbcore and ehci_hcd) solves the problem till 
next suspend.

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Lucid: No USB after resume on Thinkpad X201, T410, T510
https://bugs.launchpad.net/bugs/566149
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