<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'><style>p { margin: 0; }</style><div style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 0);">I am trying to run some c++ code, part of which opens a serial port, then reads and writes to that device. The code works perfectly on a friend's laptop, but fails to read on mine, so we know it's not the c++ code. I have an hp dv6000 series laptop running Kubuntu 8.10.<br><br>I have a usb to serial adapter plugged in and it is recognized:<br><br>diane@diane-laptop:~$ dmesg | grep tty<br>[ 0.004000] console [tty0] enabled<br>[ 1.839861] tty ttyd1: hash matches<br>[ 5508.311495] usb 4-1: pl2303 converter now attached to ttyUSB0<br>diane@diane-laptop:~$<br><br><br>diane@diane-laptop:/dev$ ls -al ttyU*<br>crw-rw---- 1 root dialout 188, 0 2009-04-06 15:30 ttyUSB0<br>diane@diane-laptop:/dev$<br><br>To make sure I had read/write permission:<br><br>diane@diane-laptop:/dev$ sudo chmod a+rw ttyUSB0<br>[sudo] password for diane:<br>diane@diane-laptop:/dev$ ls -al ttyU*<br>crw-rw-rw- 1 root dialout 188, 0 2009-04-06 15:30 ttyUSB0<br>diane@diane-laptop:/dev$<br><br>Also, I am a member of dialout:<br><br>diane@diane-laptop:/dev$ groups<br>diane root sys adm tty proxy dialout fax cdrom floppy sudo audio dip backup src video plugdev games users scanner sshlpadmin netdev admin sambashare<br>diane@diane-laptop:/dev$<br><br>Have also tried to run the c++ program as root and that does not work either. How can I get my laptop to read and write to a serial port?<br><br>Thanks,<br>Diane<br></div></div></body></html>