Dirk,

Try using a program like minicom to access the serial port.  If you
haven't used minicom before, run "sudo minicom -s" to set up the port
parameters like port name, baudrate, framing and flow control.

Another thing to check is the existance of a ttyS0 lock file in
/var/lock.  It should be called /var/lock/LCK..ttyS0.  At least, that's
what's created on my machine when minicom is accessing the serial port.
The contents of this file should contain information about the process
that holds the lock.

The PNP disable/enable trick works for me.  I now have a fully
operational serial port.  As I said, I do not know why the serial port
isn't being correctly setup on boot, so if my work-around doesn't work
for you, there's not much that I can do to help.

Matt

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Serial ports of some HP Laptops don't work in Edgy
https://bugs.launchpad.net/bugs/74034
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