Re: USB ports don't work
- From: Paul <nospam@xxxxxxxxxx>
- Date: Sun, 22 Nov 2009 16:47:44 -0500
JClark wrote:
Hello,
(I posted this also on the ASUS site, but was hoping to get some help
sooner than that forum usually provides it.)
New install of the M4A78-E, Windows XP Pro SP3.
Problem: The on board USB ports don't work. None of them. USB ports
connected by cable to the board, such as case ports, external ports
etc work fine.
I've uninstalled all of the items under Universal Serial Bus
Controllers in Device manager, one at a time. Checked the BIOS to see
that everything with USB in it is enabled.
Very peculiar that only the ports coming directly off the motherboard
(without connectors) are not working.
This is very frustrating, with added frustration by my recognizing
(after purchase, of course) that this board doesn't have a PS2 mouse
port!
Any help or suggestions would be greatly appreciated..
Jack
There really isn't much that can go wrong. Each USB port needs power,
and there is a green Polyfuse for each pair of ports. You can see
three fuses near the I/O plate area. And three more, near the 2x5
headers for USB. You could do a quick visual check and see if any of
that is missing.
I downloaded an ATI/AMD programming manual, and the claim there,
is there are two EHCI controllers and four OHCI controllers for regular
USB ports. That means USB2 operation is split into two groups.
USB 1.1 is split a little weird, in that I think three USB ports
are tied to each USB 1.1 controller.
In any case, you could check Device Manager, and see if the
two EHCI and four OHCI items showed up. There is a fifth OHCI
which is apparently for hardware debug, and it may appear in
Device Manager as well. I don't know if they'd make an
extra effort to disable it, because there might not be
any way to physically access the associated ports on a
finished motherboard.
What you see in Device Manager is not a "port". You cannot count
ports by looking at Device Manager. What shows in Device Manager
are the logic blocks driving the ports. If the Southbridge is
designed to drive three ports from one OHCI, you see one OHCI
entry in Device Manager.
Based on your failure symptoms, it could be everything on one
of the EHCIs that isn't working. But again, it is unlikely
for something to fail that way. If an EHCI block wasn't working,
the OHCI still might, and a plugged in device would end up
controlled by OHCI. Which is why I'd be more focused on verifying
the ports are getting power, than anything else.
OHCI (USB1.1) ---X\ One logic block or
+-X----- Physical port the other one, is in
EHCI (USB2) ---X control of the port
The only chip in my recollection, with a serious issue with
USB, was Intel ICH5. The internal bond wires used to burn,
the ones that feed the USB I/O pads. This would cause all USB ports
to be "dead". But all the logic blocks would still appear to
be working in Device Manager. It was down at the I/O level, that
the I/O pads didn't have any power, so the I/O wasn't able to
communicate with any connected USB items. There hasn't been
that style of failure in chip design, since that happened.
So I doubt this is a chip design issue, or even a chip test issue.
I'm sure the chip was fully tested before it left the AMD factory.
If you can't get it working, return the motherboard.
Paul
.
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