On Sun 16 May 2010 22:30 -0400, Alan Stern wrote: > > * Case 1 (USB DSL modem first, then USB keyboard): > > > > usb 1-1: reset low speed USB device using uhci_hcd and address 3 > > usb 1-1: reset low speed USB device using uhci_hcd and address 3 > > # > > # The last line keeps repeating. > > # > > # At this point, the Numlock indicator of the USB keyboard is on but the > > # keystrokes do not register. The PS/2 keyboard keeps working, although > > # sluggishly. > > Those repeating error messages are unfortunate. At some point the > driver should give up. And maybe it should give an indication of _why_ > the resets are needed. I have a dmesg output in which the reset message repeats a thousand times during half an hour (thus, at a rate of about 1 message every one or two seconds). The messages disappeared because I unplugged the keyboard. Is there any debug or verbose flag I can enable in order to have more indications? > > * Case 2 (USB keyboard first, then USB DSL modem): > > > > ATM dev 0: usbatm_submit_urb: urb 0xcfa8abe0 submission failed (-28)! > > -28 is -ENOSPC, which means there is not enough bandwidth available on > the USB bus for both devices to run at the same time. Strange. I don't expect a USB keyboard to be bandwidth-consuming. Moreover, the same USB DSL modem works when doing a scan using a USB scanner plugged in place of the USB keyboard. > If you have other USB ports available, you should try plugging one of > the devices into them. UHCI controllers usually have only one or two > ports, so any other ports will be on a different bus. Unfortunately, the hardware in not quite recent. There are only two USB ports, and they are connected to the same bus. Khanh-Dang Nguyen Thu Lam -- 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
