I just noticed the following firmware update for the NEC USB 3.0
controller for the Thinkpad W510 at
http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-75165
Version 3.0.2.5
* (New) Initial release
* (New) Mass Storage Class UAS (USB Attached SCSI) is supported.
* (Fix) Added the workaround of xHCI Driver Unload Problem.
I don't know what exactly this workaround refers to, but it sounds a lot
like this bug. The release date is 2010/05/17.I believe my original
firmware version was 3.0.2.1. I haven't yet tested this in Ubuntu, since
I'm mostly running in Win7 for now. I suppose that to properly test
this, I'll have to remove the
SUSPEND_MODULES="xhci"
line from the file
/etc/pm/config.d/unload_modules.
--
XHCI (USB 3.0) kernel Module Prevents Suspend
https://bugs.launchpad.net/bugs/522998
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