Hi, On 07/28/2014 04:50 PM, Oliver Neukum wrote: > On Mon, 2014-07-28 at 10:48 -0400, Alan Stern wrote: >> On Mon, 28 Jul 2014, Laszlo T. wrote: >> >>> Hello, >>> >>> I have some problems with Jmicron JMS567 (Sata 6 Gb/s -> USB3.0) >> mobile rack. >>> >>> I tried on different kernels: >>> 3.15.5 >>> 3.16.rc6 >>> >>> I got the following errors when I ran a mkfs.ext4 command and then >> the >>> device disappeared. >>> >>> Jul 26 19:54:37 debian kernel: [ 118.060026] usb 8-3: new >> high-speed >>> USB device number 2 using ehci-pci >> >> Hans, shouldn't we default to usb-storage rather than uas if the >> device >> supports both and isn't connected at SuperSpeed? > > We would give up command tagging needlessly. Right, that is what I was about to say. For testing purposes I've a Fedora rawhide install a ssd in a usb3 uas 2.5" enclosure, and it is much faster with uas in usb2 ports too. It looks like the device disconnects as soon as we start using multiple requests at once (it seems to disconnect immediately after the basic probing). This could be a power issue. Laszlo, what sort of drive is in the mobile rack, and how is it powered ? Regards, Hans -- 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
