Same problem here, I remounted an external USB2.0 drive and noticed it
was deathly slow... Checked the "Drive" tab, saw 12Mbps (USB1.1)...

I tried the workaround in the bug description... got up to this step:
7) sudo modprobe ehci_hcd

Then immediately after issuing this command, my computer froze... after waiting 
a while, I hard-resetting it
Reconnected the drive after it booted, and I had 480Mbps!

Not sure if there is a safer way to reset the speed?

Cheers,

Gaspard

-- 
slow USB 2.0 drive: it's mounted as USB 1.0, not USB 2.0!
https://bugs.launchpad.net/bugs/177235
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