Messages in this thread | | | Date | Thu, 07 Jun 2007 23:42:43 +0200 | From | Robert de Rooy <> | Subject | Re: ThinkPad T41 - Strange USB 2.0 behaviour |
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Joel Becker wrote: > On Thu, Jun 07, 2007 at 10:23:19PM +0200, Robert de Rooy wrote: > >> On my ThinkPad T41 USB 2.0 behaves strange. Most USB 2.0 devices, refuse >> to function as such. Under Windows I get a message that I should plug >> the device into a USB 2.0 port (but it continues to function as USB >> 1.1), while under Linux I need to manually unload ehci-hcd before I can >> access the device. >> >> The strange thing is that these USB 2.0 devices used to work just fine, >> and still do on other machines. In addition I have one USB 2.0 memory >> key that still works fine (both under Windows and Linux). >> >> Now to be honest, I think this is a hardware problem, as I have had >> another T41p before that also suddenly no longer liked USB 2.0 devices, >> and if you search with Google you find other ThinkPad T41 users >> complaining about similar behaviour. >> > > Hardware problem. You need a new system board. I had this > problem on my T41, devices would sometimes work, sometimes not > (depending on the reboot). If I plugged in a USB 1.1 hub, then pluged > the memory reader into the hub, it would always work at 1.1 speeds. > New system board, USB 2.0 works just fine. > > Joel > 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).
Regarding getting the systemboard replaced, this machine is already scheduled for replacement, and I should be getting a new one in the next few weeks. But other users apparently have been having similar problems, and might not want to get the (presumably out-of-warranty) systemboard replaced. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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