Re: ThinkPad T41 - Strange USB 2.0 behaviour
From: Robert de Rooy
Date: Fri Jun 08 2007 - 06:09:50 EST
Jiri Kosina wrote:
On Thu, 7 Jun 2007, Robert de Rooy wrote:Yes I can unload ehci-hcd, but I have one USB 2.0 device that strangely
enough DOES work as such, and unloading ehci-hcd will cause that also to
run at 1.1 speed.
Yes I figured it was a hardware problem, but that was not really the
point I was trying to raise ;). I would like, if possible for Linux to
automatically fallback to USB 1.1 like Windows does (preferably with a
What do you propose as a trigger for the kernel to fallback?
You can work it around manually, just don't use ehci-hcd, can't you?
Clearly something is failing when plugging a device with ehci-hcd
loaded, the driver seems to keep retrying indefinitely. Instead it would
be nice if after a few tries it hands the device over to uhci-hcd. This
seems to be the behaviour under Windows, so I was wondering if Linux
could be made to do something similar.
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