Red Hat Bugzilla – Bug 218531
serial port input on rhel5b2 is unreliable
Last modified: 2014-08-31 19:28:34 EDT
Description of problem:
ttyS1 on fenlason-lab2.lab.boston.redhat.com does not work well with the
RHEL5B2 kernel. Many characters are getting dropped, and dmesg is filling with
many lines saying
ttyS1: 28 input overrun(s)
(and other random numbers). This makes the serial console to my rawhide box
very hard to use.
This hardware worked fine with RHEL4U4.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.minicom from the RHEL5B2 box to the rawhide box
2.log in and cat /etc/motd on the rawhide box
3.observe that the output is trashed
usually. Sometimes you can cat /etc/motd successfully.
no garbled output
Using acpi=off it's not possible to reproduce the problem.
Compaq Proliant ML350, BIOS version D04/F04 09/22/2000
Actually D04 is the model. Updated to a newer BIOS version. Seems the problem is
The BIOS upgrade fixed the problem.