linux-kernel - Re: ThinkPad T41 - Strange USB 2.0 behaviour

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Date:	Fri, 08 Jun 2007 12:09:32 +0200
From:	Robert de Rooy <robert.de.rooy@...il.com>
To:	Jiri Kosina <jikos@...os.cz>
CC:	Joel.Becker@...cle.com, linux-kernel@...r.kernel.org,
	greg@...ah.com
Subject: Re: ThinkPad T41 - Strange USB 2.0 behaviour

Jiri Kosina wrote:
> On Thu, 7 Jun 2007, Robert de Rooy wrote:
>
>   
>> 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 
>> suitable warning).
>>     
>
> 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?
>
>   
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.

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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