The unloading and reloading of the ehci_hcd module gave me an idea. Does
the ehci_hcd do something different when the device is plugged in, than
from when it starts up.

I found that by booting (standard hardy 2.6.24 generic kernel) with the
sansa clip plugged in. The sansa mounts automatically at USB2 speeds.

So there must be something different in the connect procedure when
echi_hcd module loads, and connect procedure when a device is plugged in
after the module has started. The difference in the procedure, is
probably different to what windows does, and the sansa doesn't like it.
I've no idea what the problem is though.

-- 
usb connect problems
https://bugs.launchpad.net/bugs/231049
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