My best thought is you have a hairline crack on the motherboard, and
when you flex the machine just-so, it bends the motherboard such that
the crack opens. But first I would take a look at where the USB
connector is connected to the motherboard, because often the
mechanical stress of plugging and unplugging, or even displacing the
USB plug up and down while connected, is enough to cause that solder
joint to fail. With single or double sided boards one can bridge such
a crack with a small piece of wire, but most complex circuit boards
are multi-layer these days, and are essentially unrepairable by the
layman. However, if it's just the USB connector, you might be able to
carefully solder it back.
On Dec 7, 2008, at 1:24 PM, Ed Kohlwey wrote:
Hi Everyone,
As some of the group regulars know I've been having problems with my
laptop "flipping out" lately. When pressure is applied to the case
in a
certain way, anything connected on USB stops working, and I get a slew
of errors in dmesg (attached below). The computer will also refuse to
boot the first 20 or so times that I hit the power button after such
an
event. To get it to turn back on I have to shake it, disconnect the
power supply, etc. a few times. The really weird thing is that I can
negate the effects of the "flip out" by suspending and resuming the
laptop before a complete power down (at least this seems to work
consistently, I'm not completely sure if this is actually connected or
not).
My first intuition was that it might be a short, so I opened up my
case
and covered most of the bare metal with either plastic or electrical
tape. For a while, the computer would also turn itself off, and the
electrical tape fix seems to have at least remedied that behavior.
Does anyone have any ideas on how to troubleshoot this sort of
issue? It
seems almost certain to me that its electrical in nature, but short of
what I've done I don't really have any ideas.
-Ed
====================================================================
[ 2437.744104] usb 1-1: USB disconnect, address 2
[ 2438.052062] usb 1-1: new full speed USB device using uhci_hcd and
address 3
[ 2438.172170] usb 1-1: device descriptor read/64, error -71
[ 2438.396053] usb 1-1: device descriptor read/64, error -71
[ 2438.612070] usb 1-1: new full speed USB device using uhci_hcd and
address 4
[ 2438.732056] usb 1-1: device descriptor read/64, error -71
[ 2438.956131] usb 1-1: device descriptor read/64, error -71
[ 2439.172058] usb 1-1: new full speed USB device using uhci_hcd and
address 5
[ 2439.580046] usb 1-1: device not accepting address 5, error -71
[ 2439.692043] usb 1-1: new full speed USB device using uhci_hcd and
address 6
[ 2440.104051] usb 1-1: device not accepting address 6, error -71
[ 2440.105410] hub 1-0:1.0: unable to enumerate USB device on port 1
[ 2440.106752] hub 3-0:1.0: port 1 disabled by hub (EMI?),
re-enabling...
[ 2440.106763] usb 3-1: USB disconnect, address 5
[ 2440.107160] btusb_intr_complete: hci0 urb ffff880074099600 failed
to
resubmit (19)
[ 2440.111402] btusb_send_frame: hci0 urb ffff880060b29cc0 submission
failed
[ 2440.600069] usb 3-1: new full speed USB device using uhci_hcd and
address 6
[ 2440.720071] usb 3-1: device descriptor read/64, error -71
[ 2440.944056] usb 3-1: device descriptor read/64, error -71
[ 2441.160051] usb 3-1: new full speed USB device using uhci_hcd and
address 7
[ 2441.280063] usb 3-1: device descriptor read/64, error -71
[ 2441.504071] usb 3-1: device descriptor read/64, error -71
[ 2441.720060] usb 3-1: new full speed USB device using uhci_hcd and
address 8
[ 2442.128053] usb 3-1: device not accepting address 8, error -71
[ 2442.240052] usb 3-1: new full speed USB device using uhci_hcd and
address 9
[ 2442.648041] usb 3-1: device not accepting address 9, error -71
[ 2442.649393] hub 3-0:1.0: unable to enumerate USB device on port 1
