On Sun, 15 Jul 2007, Rogier Wolff wrote: > > It's kind of involved. In brief: The computer's USB hardware detects a > > new connection and generates an interrupt. The hub driver learns that > > a new device has been connected to some port and goes through a complex > > initialization and enumeration procedure, which involves resetting the > > port, assigning the device an address, reading the device's > > descriptors, and choosing a device configuration. Once that's all > > done, the device will appear in /proc/bus/usb/devices. > > My kernel reports: > New USB device found on port ...
Mine doesn't. For example, I just plugged in a USB flash storage device. The only kernel messages appearing during the initialization phases were these two: usb 6-4: new high speed USB device using ehci_hcd and address 2 usb 6-4: configuration #1 chosen from 1 choice (Note, this is without CONFIG_USB_DEBUG enabled.) The first of those doesn't get printed until after the port has been successfully reset. > If enumeration and assigning an addres fails, I get a message saying > that a few seconds later. If Haines doesn't get the "new USB device" > message, there is something wrong with the camera, cable or the port. That's what I said earlier. > Interrupts on his USB devices seem to work as other devices are > detected. The question is not whether interrupts are working; the question is whether an interrupt occurs when the camera is plugged in. If it doesn't, that's a pretty clear indication that the camera or the cable is at fault. And it indicates that the problem occurs right at the beginning of the normal device-detection pathway. This is also why I asked whether the camera works when plugged into a different computer. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
