Bug 1005625 - System boots up with serial port RTS asserted
System boots up with serial port RTS asserted
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-09-08 22:49 EDT by Jim Haynes
Modified: 2013-09-09 15:34 EDT (History)
7 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-09-09 15:34:25 EDT
Type: Bug
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Description Jim Haynes 2013-09-08 22:49:35 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.

Additional info:
Comment 1 Josh Boyer 2013-09-09 08:58:59 EDT
Do you have modemmanager installed?  If so, uninstall it and see if the problem goes away.
Comment 2 Jim Haynes 2013-09-09 15:34:25 EDT
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.

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