On 20/10/12 00:16, Rodrigo Rivas wrote:
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
Ah. It was working on all three ports a couple of weeks ago; I normally
use the right port for my USB dongle as it's too big to fit in the left
ports. I obviously don't have logs from then to see whether it was being
mounted as USB3 or 2.
Looking at the output of lshw, it seems that the left ports are xhci and
the right one is ehci. There's also a lot of other USB "ports" listed,
but I'm guessing those are used internally (keyboard uses USB driver
perhaps?).
I'll try blacklisting the xhci-hcd driver and see what happens.
