Red Hat Bugzilla – Bug 1005625
System boots up with serial port RTS asserted
Last modified: 2013-09-09 15:34:25 EDT
Description of problem:System with a real serial port - during bootup the
request-to-send lead is asserted and stays so, until an application uses
the port. This is annoying when RTS is used to control a radio transmitter.
Version-Release number of selected component (if applicable):I'm not sure how
long this has been going on, but it's been a while.
How reproducible: Always
Steps to Reproduce:
1.Monitor RTS lead on serial port
2.Boot up system
Actual results:RTS lead is asserted until I log in and start an application
that connects to the serial port ttyS0
Expected results: Should not assert the RTS signal until something wants
to use the port.
Do you have modemmanager installed? If so, uninstall it and see if the problem goes away.
Thanks. That turned out to be the problem - case closed.
Altho it was a little more obscurified than that - the program running is
named modem-manager and the package is named ModemManager, so at first I
didn't find it.