USB 2.0 Unknown Devices

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Guest

(also posted in the Hardware forum)

Hello everyone, I hope someone can help me with this issue, it's been driving
me nuts for weeks!

My system:
ASUS P4S533-VM
Windows XP Pro SP2
4 on-board USB ports
Device Manager shows "SiS PCI to USB Enhanced Host Controller"

Problem: USB 2.0 suddenly stopped working. Device Manager shows 2 Unknown
Devices. If I disable the Enhanced Host Controller, the unknown devices get
detected (Epson scanner and D-Link USB hub), but they are running only as USB
1.1 or slower. If I enable the Host Controller, they become unknown devices
again. SiS and D-Link says WinXP should detect and install the drivers for
the USB.

Steps already taken:
1) Updated the mobo BIOS to latest version
2) Re-installed SP2 .
3) Unplugged all USB devices
4) Uninstalled all USB in Device Manager
5) Rebooted and let WinXP detect everything.
6) Right-click, update driver. (wizard could not find a better match...)
7) Did this in Safe Mode and Normal mode.

The thing is, it was working for maybe a year or so since SP1, and for
months since I upgraded to SP2. Then a few weeks ago, it just stopped working.


Any help is greatly appreciated. Thanks!
 
I see you had these devices working earlier. Hope the ports are not
malfunctioning. Try updating chipset drivers too.

If your computer has any diagnostics software like PC Doctor run a test on
the ports.
 
MGS3 said:
Problem: USB 2.0 suddenly stopped working. Device Manager shows 2 Unknown
Devices. If I disable the Enhanced Host Controller, the unknown devices
Click to expand...

I wish I could offer you help, as the same thing has happened to one of my
computers. All of a sudden XP has lost sight of my USB2 devices. I hadn't
installed a thing, nor do I even use that computer very often. I haven't
had the time to try and troubleshoot it. But it does show just what a mess
M$ has made with their USB2 drivers. Simply ... they are a p.o.s.

Good luck resolving the problems. I know I'll need it. :-(
 
It has happened to me that the O/S seems to lose track of a plugged in
device if it is not used for a while. In my case it is a USB 2.0 scanner.
All I have to do is unplug the USB cable from the scanner and then plug it
back in. The device is then detected and runs fine. Give it a try!

--
Regards,

Richard Urban

aka Crusty (-: Old B@stard :-)

If you knew as much as you think you know,
You would realize that you don't know what you thought you knew!
 
Hi

I have just xperienced exactly the same thing, also with the SIS PCI USB
Enhanced Controller. Might this be a general propblem with the SIC PCI
controller ? I have tried to find something on SIS homepage, but without
luck. It is a real pain i the .... I have removed SP 2, but it does not work
anyway. Thanks MS, before the SP2 everything worked perfectly, no my
Videocapture device, DVD-burner and flash disks only work at slow speed, that
true product development ...
Regards
Lars

"MGS3" skrev:
 
Thanks for the replies everyone. I've posted the same thing on USBMAN.COM and
will follow a set of tips here:

http://www.usbman.com/Guides/SiS USB Tips and Tricks.htm

Anyway, I've spent a lot of time on this and will probably just buy a 5 port
USB PCI card. I've googled the issue and have seen many questions with the
SiS chipset, but not one working solution.

Eleven years working with computers and I can't figure this out. As Master
Yoda would say, "Hmm, how embarassing..." (sorry, I've just been through a
marathon viewing of Star Wars)

Hope you all had a good long weekend.
 
Thanks for replying back.
--
Jonybrv


MGS3 said:
Thanks for the replies everyone. I've posted the same thing on USBMAN.COM and
will follow a set of tips here:

http://www.usbman.com/Guides/SiS USB Tips and Tricks.htm

Anyway, I've spent a lot of time on this and will probably just buy a 5 port
USB PCI card. I've googled the issue and have seen many questions with the
SiS chipset, but not one working solution.

Eleven years working with computers and I can't figure this out. As Master
Yoda would say, "Hmm, how embarassing..." (sorry, I've just been through a
marathon viewing of Star Wars)

Hope you all had a good long weekend.
Click to expand...
 
Hello,

It's been a while since my last post, and I was able to finally make my USB
2 work! Now, there is no guarantee that this is the definite solution, it
could be specific to my hardware, but for those deperate to try anything,
here goes:

(Note: BIOS settings are different, so the info below is only a concise
version of an ASUS P4S533-VM. Poke around to find where your settings are
located)

Initial BIOS settings:
plug and play OS:No
USB enabled: Yes
Usb 2.0 : Yes

Initial Windows settings:
WinXP SP2 (latest USB drivers)
All USB ports in device manager: enabled (This kills the 2.0 and runs only
in 1.1)

Steps taken:
1) Disable ALL USB ports in device manager.
(note: make sure you have a PS2 mouse/keyboard)
2) Reboot to BIOS
3) Set plug and play OS to YES
4) Set USB enabled: NO (this automatically sets the 2.0 to NO)
5) Save to BIOS
6) Reboot to OS
7) Reboot to BIOS
8) Set USB enabled: Yes
9) Set Usb 2.0 : Yes
10) Reboot to OS
11) Enable all USB in Device Manager

This worked for me, and I hope this helps somebody else.

Good luck!
 
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