[Bug 88746] Re: ehci_hcd module causes I/O errors in USB 2.0 devices

markofealing mark at ferns16.plus.com
Fri Jan 1 11:52:58 UTC 2010

I've also got this problem with a Freecom 160Gb USB drive Model
(SSJABA), known as the Freecom Mobile Drive XXS, it is USB2.

If it is correctly detected by Karmic (also an issue with earlier
versions of Ubuntu), it is very slow in reading and writing files (USB
1.1 Speed rather than USB2) when compared to a 80Gb Buffalo MiniStation
USB disk I also have.

I've experienced problems on some NEC, VIA (all), and Alcor USB2
controller chipsets, although with Intel I've not had a problem but this
is probably because my only Intel USB controller is USB1.1!

Dropping back to USB1.1 drivers fixes the problem but is unworkable with
high capacity devices.

ehci_hcd module causes I/O errors in USB 2.0 devices
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