Hi, I have USB device, a palm T5 PDA. When connecting to the linux desk top (F6 Linux 2.6.22.9-61.fc6 #1 SMP Thu Sep 27 18:07:59 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux), it plays a random game. Some time it connected to the desktop successfully with those message (dmesg): usb 4-1: new full speed USB device using uhci_hcd and address 76 usb 4-1: configuration #1 chosen from 1 choice visor 4-1:1.0: Handspring Visor / Palm OS converter detected usb 4-1: Handspring Visor / Palm OS converter now attached to ttyUSB0 usb 4-1: Handspring Visor / Palm OS converter now attached to ttyUSB1 usb 4-1: USB disconnect, address 76 visor ttyUSB0: Handspring Visor / Palm OS converter now disconnected from ttyUSB0 visor ttyUSB1: Handspring Visor / Palm OS converter now disconnected from ttyUSB1 visor 4-1:1.0: device disconnected In bad times, I can't connect it to desktop at all and got errors alike this: usb 4-1: new full speed USB device using uhci_hcd and address 77 usb 4-1: device descriptor read/64, error -71 usb 4-1: device descriptor read/64, error -71 usb 4-1: new full speed USB device using uhci_hcd and address 78 usb 4-1: device descriptor read/64, error -71 usb 4-1: device descriptor read/64, error -71 usb 4-1: new full speed USB device using uhci_hcd and address 79 usb 4-1: device not accepting address 79, error -71 usb 4-1: new full speed USB device using uhci_hcd and address 80 usb 4-1: device not accepting address 80, error -71 usb 4-1: new full speed USB device using uhci_hcd and address 81 usb 4-1: device descriptor read/64, error -71 usb 4-1: device descriptor read/64, error -71 usb 4-1: new full speed USB device using uhci_hcd and address 82 usb 4-1: device descriptor read/64, error -71 usb 4-1: device descriptor read/64, error -71 usb 4-1: new full speed USB device using uhci_hcd and address 83 usb 4-1: device not accepting address 83, error -71 usb 4-1: new full speed USB device using uhci_hcd and address 84 usb 4-1: device not accepting address 84, error -71 where to look for fix? thanks Yuan