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Message-ID: <46692ADC.4050604@gmail.com> 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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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