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[ubuntu] Prolific Technology PL2303 Serial Port acting abnormal on Dell T1500 Ubuntu 11.04

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http://ubuntuforums.org – I am using Prolific Technology PL2303 Serial Port on Dell T1500, with Ubuntu 11.04 # lsusb Bus 001 Device 022: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port The device ttyUSB0 can show up on PC, and minicom/gtkterm can be started on this device. However, during the usage, there will be data lost. I verified the cable with minicom/gtkterm/cu work well on another Dell 380, with Ubuntu 11.04. Anyone seen similar thing before? Any suggestions? Thanks, -Ethan (Hardware)