On Mon, 4 Jul 2011, Graeme Gill wrote: > A user has reported similar problems with certain hardware/Linux > combinations, and has provided some usbmon traces of the > a not working and working systems. > > The high level and usbmon traces are here: <http://users.abo.fi/jskata/spyder2_argyllcms/> > > The not-working usbmon trace is this one, using the ASRock P67 Pro3 > system: > <http://users.abo.fi/jskata/spyder2_argyllcms/spyder2_asrock_p67_pro3.txt> > > and the working one is this one, using a thinkPad X40 system: > <http://users.abo.fi/jskata/spyder2_argyllcms/spyder2_tpx40.txt> > > Are there any insights to be gleaned from these traces ? A little, not much. It looks like on the ASRock P67 system, the low-speed device is attached through a hub, probably to a high-speed controller, whereas on the ThinkPad X40 the device is attached directly. The hub itself behaves a little oddly because it doesn't report the connection as low-speed until the port has been enabled. Is this the so-called "rate-matching" hub that Intel is using in their more recent chipsets? The first interrupt transfer on the P67 succeeds, but all the following transfers time out. The hub may well be to blame. > The user reports that none of the USB ports on the ASRock P67 Pro3 > would work with this device, but that a PCI based USB card plugged > into the system works. That's consistent with the P67's internal hub not working right. Can the user check whether an ordinary USB keyboard (one without an internal hub) works with that computer? Also, can the user get hold of a USB-2.0 hub and place it between the P67 and the device? Then the Transaction Translator in the external hub would be used instead of the TT in the internal hub. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
