usb problem-device not accepting address error -71
I am facing a problem with USB device...
I am trying to plug-in the usb device ( mobile phone through data cable) to the usb port of linux machine...previously it was working fine and I could see the new device /dev/ttyACM0 as soon as I plug-in...but suddenly it stopped showing the device and I could see some error messages in /var/log/messages
those are :
Nov 15 12:23:57 usboc0202 kernel: usb 5-1: new full speed USB device using address 3
Nov 15 12:23:58 usboc0202 kernel: usb 5-1: device not accepting address 3, error -71
Nov 15 12:23:58 usboc0202 kernel: usb 5-1: new full speed USB device using address 4
Nov 15 12:23:58 usboc0202 kernel: usb 5-1: device not accepting address 4, error -71
I surfed in the internet and found that interrupts are shared by BIOS and usb host controller driver and according to their suggestion, I have made boot option acpi=off, but still I am getting the same error...any clue why it happens....
It would be really appreciated if any one can help me for this....