On Sat, 7 Sep 2013, joe M wrote: > Hello Sarah, Alan, > > Just wanted to check if you have any suggestions on how to go about > debugging this issue. Nothing that I haven't mentioned previously. > I get these messages "usb 6-1: device not accepting address 5, error > -62" when I connect my FS device to a USB 3.0 hub. I logged the > messages from the device and can see a USB Reset happening. But, > nothing else is happening after that. > > I attached a USB mouse to the USB3.0 port and it worked. I attach my > FS device to a USB 2.0 or USB 1.1 port and it works. You should note that when a device is attached to a USB-2 or USB-1.1 port, the computer does the following: Port reset Send a 64-byte Get-Device-Descriptor request to address 0 (the device will return only the first 8, 16, or 18 bytes of the descriptor, depending on the maxpacket size for ep0) Port reset Send a Set-Address request Send an 18-byte Get-Device-Descriptor request By contrast, when a device is attached to a USB-3 port, the computer does the following: Port reset Send a Set-Address request Send an 8-byte Get-Device-Descriptor request Send an 18-byte Get-Device-Descriptor request It's possible that your device works with the first event sequence and not the second. What happens if you do: echo 1 >/sys/module/usbcore/parameters/old_scheme_first before plugging the device into a USB-2/1.1 port? This will cause the system to use the second procedure above instead of the first. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
