Do you have an uhci-hcd module loaded? I have the following statement in my (Fedora) /etc/modprobe.conf: alias usb-controller uhci-hcd I found the following web site helpful, by the way: http://www.linux-usb.org/USB-guide/book1.html Chuck Hallenbeck writes: > I am trying for the first time to access a USB device and having a > problem doing so. The device is my new UPS from American Power > Conversion, which I plan to monitor with a program called apcupsd. The > manual describes how to configure my system for USB and how to test the > USB interface before running the program, and that is where I am stuck. > > It appears to me to be an interrupt problem. Here is why I think so. For > the past month or two I have noticed a peculiarity that happens within > about a minute after booting up the computer. Normally I start logging > in various users on difference consoles, and while I am doing that, I > get a spontaneous message saying that IRQ 5 is being disabled. The > message says something cute like, "Nobody cares!" and then disables IRQ > 5. Examining the IRQ assignments, I see that the only device assigned to > that IRQ shown in /proc/interrupts is the uhci-hcd driver. That has not > been a problem until now, since until now I have not attempted to access > a USB device, which requires the uhci-hcd driver. > > When I plug the cable from my UPS into a USB slot, the device is > correctly identified by manufacturer, serial number, etc., but then it > says that it fails to register with usbcore. And the test program > confirms that the device cannot be accessed. > > My kernel is 2.6.11.6, and all the relevant drivers are compiled into > the kernel. It looks to me like the uhci-hcd driver has been assigned to > IRQ 5 but is not responding to that interrupt when it occurs. If someone > has seen this kind of thing before, or has any suggestion how to proceed > with troubleshooting this one, I would sure appreciate hearing about it. > The software I plan to run to monitor the UPS is not involved here as > yet, since I have to resolve the USB interface to the UPS before there > is a hope in hell of that software working. If it would be of value to > share any of the error messages or other data, I would be happy to do > so. > > Any ideas? I have run out. > > Chuck > > > -- > The Moon is Full > But you can still get downloads from http://www.mhcable.com/~chuckh > > _______________________________________________ > Speakup mailing list > Speakup at braille.uwo.ca > http://speech.braille.uwo.ca/mailman/listinfo/speakup -- Chair, Accessibility Workgroup Free Standards Group (FSG) janina at freestandards.org http://a11y.org Janina Sajka Phone: +1.202.494.7040 Partner, Capital Accessibility LLC http://www.CapitalAccessibility.Com Bringing the Owasys 22C screenless cell phone to the U.S. and Canada. Go to http://www.ScreenlessPhone.Com to learn more.
