Bug 713240

Summary:	Serial console doesn't work over USB-serial converter
Product:	[Fedora] Fedora	Reporter:	fedora
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED WONTFIX	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	15	CC:	fedora, gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, mishu
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-07-11 17:51:06 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description fedora 2011-06-14 19:01:31 UTC

Description of problem:
I tried to enable the serial console functionality of the Linux kernel, because I want to find out the reason for occasional lock ups (like it's suggested on the Fedora wiki).
Because this is a laptop that doesn't have a built-in serial port, I used a USB-to-serial converter.
According to the Remote Serial Console Howto [http://tldp.org/HOWTO/Remote-Serial-Console-HOWTO/configure-kernel.html] this is supposed to work since kernel version 2.5.7.

Version-Release number of selected component (if applicable):
Latest kernel package in F15

How reproducible:
Every time.

Steps to Reproduce:
1. Append
     console=tty0 console=ttyUSB0,115200n8
   to the kernel command line in the grub menu.lst file.
2. Connect the USB-serial converter.
3. Connect a second computer over a serial cable and run the command 
     # cu -s 115200 -l /dev/ttyUSB0
   on it.
4. Reboot.

Actual results:
On the second computer, nothing at all happens.

Expected results:
I expected to see the boot messages, and later a login prompt.

Additional info:
When running the cu(1) command above on both computers, I can observe what I am typing on one computer on the other one, so this seems neither caused by a hardware problem, nor by missing device drivers in the kernel.

Comment 1 Josh Boyer 2012-06-06 13:50:37 UTC

Are you still having issues with this?  If you put the ttyUSB0 console before tty0, does it behave differently?

Comment 2 Josh Boyer 2012-07-11 17:51:06 UTC

Fedora 15 has reached it's end of life as of June 26, 2012.  As a result, we will not be fixing any remaining bugs found in Fedora 15.

In the event that you have upgraded to a newer release and the bug you reported is still present, please reopen the bug and set the version field to the newest release you have encountered the issue with.  Before doing so, please ensure you are testing the latest kernel update in that release and attach any new and relevant information you may have gathered.

Thank you for taking the time to file a report.  We hope newer versions of Fedora suit your needs.