On Fri, Oct 19, 2012 at 8:16 AM, Robbie Smith <zoqaeski@xxxxxxxxx> wrote: > I've been having troubles mounting an external USB HDD to two of the three > USB ports on my laptop. dmesg reports a timeout connecting to the device; > plugging in other devices to the same ports works fine with no errors. I've > attached the log here[1]. > > The drive in question is a Seagate 1.5 TB Expansion Portable Drive, model > ST1500LM003-9YH148. I reformatted it upon purchase to have two partitions, > a NTFS one for Windows compatibility, and an Ext4 one for Linux backups and > miscellanea. Each partition is ~750GB in size. > > Any idea what is going on? I think the issue may be with the drive, which > is virtually brand new (I bought it ~3 months ago). > > [1] https://gist.github.com/3916478 > Look at the working Verbatim drive: #Left: [ 1689.742443] usb 3-1: new high-speed USB device number 2 using xhci_hcd #Right: [ 2115.686272] usb 5-1: new high-speed USB device number 4 using ehci_hcd See any difference? Yes, one is Xhci and the other Ehci. AFAIK the xhci is USB3 and the ehci is USB2. So it seems that your HD is trying to use USB3 but it is failing. The other port, however, uses ehci directly and works fine. I guess that blacklisting the xhci-hcd driver should may it fallback to ehci and just work, but I don't have any USB3 device or motherboard, so I cannot tell for sure. Other option is to disable the USB3 support in the BIOS, if you can find such an option. HTH -- Rodrigo
