On Fri, 11 Sep 2015, Hans-Peter Jansen wrote: > Hi Mathias, > > with some changes within the 4.0 time frame, together with a new driver frontend > resolved the scanner issue for me. Thanks. > > I still have trouble with storage devices on xhci ports, that disappear as soon > as I change to an ehci port. > > My current kernel version is 4.1.6. > Device is a Transcend TS-RDF8K USB3.0 sdcard reader, tested directly on rear panel > I/O USB3.0 port of a z97 series MB (ASUS Z97-A) with the original cable, and a > SanDisk Ultra 64GB SDXC media. > > I experience similar issues with other USB3.0 readers as well. > > Here's a typical log of a dysfunctional attach [line wrap intentionally switched off]: ... > This reset sequence persists until the device is unplugged. > > Here a successful sequence: ... > In this combination, the device can be used reliable to read and write stuff. > > Any idea, what's going wrong here with xhci? Can you post a usbmon trace showing what happens when the card reader is plugged in? Instructions are in the kernel source file Documentation/usb/usbmon.txt. 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
