We have 12.04 and experienced this problem.
Usage with gtkterm - no problem, communication ok.
With blocking usage, it blocked (sometimes) on open using:
fd = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY | O_SYNC );
or
fd = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY );
After hours of testing we found out that those lines (directly executed
afterwards) solves the problem ... strange:
fd = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY | O_NONBLOCK);
fcntl(fd, F_SETFL, 0); //restore normal (blocking) behavior
Now we can read and write as under 10.10. We hope that helps other
developers.
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https://bugs.launchpad.net/bugs/661321
Title:
Opening /dev/ttyUSB0 hangs, pl2303.ko module
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