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

[phaidros]

Just tested with 2.6.27-3-generic on t41p and the issue is still the same:
- using ehci_hcd gives repeated:
Sep 16 00:53:59 tiber kernel: [  236.312069] usb 4-3: new high speed USB device using ehci_hcd and address 25
Sep 16 00:54:02 tiber kernel: [  239.432060] usb 4-3: new high speed USB device using ehci_hcd and address 41
[..]

- on one usb stick it falls back to uhci pretty soon: 
Sep 16 00:56:11 tiber kernel: [  368.588075] usb 2-1: new full speed USB device using uhci_hcd and address 10
Sep 16 00:56:11 tiber kernel: [  368.736047] usb 2-1: not running at top speed; connect to a high speed hub
Sep 16 00:56:11 tiber kernel: [  368.800930] usb 2-1: configuration #1 chosen from 1 choice

- on another the ehci message gets repeated around 50 times until it
falls back.

so, it seems falling back to uhci works somehow. which is good, and its
not the biggest showstopper anymore :)

but, falling back to uhci is not really nice if usb adapter *and* usb
device are high speed (aka usb 2.0) devices :-/

I have to confess, I don't unterstand the problem in full depth yet,
where exactly is the culprit we are looking for? kernel? and where
exactly is to distinguish between suspend capabilities and high speed
usb devices? (ben collins mentioned a decision which was taken about
that ..)

I'm going to try LiveCD later. Just took the intrepid kernel in for
testing now ..

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