Hi,
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....

My cable gave up.... got a new USB connector for the mobile and everything is working ok. SO NO LONGER do I have the same problem. Recent update to linux 2.6.18 did not cause it..
I have made a /dev/ttyACM0 so that the mobile is recognized; lsusb -v (or moto4lin upon 'update list' in (settings =>) preferences) shows the phone itself again (idVendor 0x22b8 Motorola PCS; idProduct 0x4902 E398 GSM Phone; iProduct 2 Motorola Phone (V235)). And, instead of the phone charging the laptop I connect to, it is back to the normal, other way round.