> Your log extract strongly suggests it is a hardware problem. Either > the NEC EHCI controller isn't working or else the thumb drive doesn't > work at high speed. Or else the two devices are somehow mutually > incompatible. Because other devices plugged into the NEC controller (e.g. the keyboard) also disappear when this happens, I am suspicious of the controller, but following the code is difficult. The clearest error message comes out of the OHCI code; what do you see in there that implicates the EHCI code path? > You can't fix hardware problems in software. Try using a different USB > storage device or a different PCIe USB card. A different unit of the same make and model? Already done; the problem is repeatable in a second machine built from the same parts list. Or do you mean a different model? I'm working on that now, but the problem is that the computer is a Mac Pro, which has only PCIe slots, and every PCIe-to-USB card I can find is built with the same NEC USB controller chip (and a PCIe bridge chip). So I'm not quite certain what to go shopping for. On the USB side, I went with SanDisk because I found that other manufactureres had quite creative interpretations of the USB standard. Like having a non-null USB serial number that was identical on every device. But thanks for the response! -- 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
