Red Hat Bugzilla – Bug 53908
Last modified: 2008-08-01 12:22:51 EDT
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User-Agent: Mozilla/4.0 (compatible; MSIE 5.0; Windows 98; DigExt)
Description of problem:
Serial port problem: Starting Linux gives as one of the messages: "LSR
Safety check engaged!" when Linux during the startup is starting the
console mouse services.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. just start Linux (in either text or KDE mode) suffices
Actual Results: The message "LSR Safety check engaged!" appears during
startup of Linux RedHat 7.1 and the mouse won't work.
Funny that the mouse worked during the setup of RedHat 7.1 in the graphics
Expected Results: guess what? :))
the mouse should have worked.
Starting X (by just typing X in a console) gives an X screen, but no
serial mouse activity.
Starting KDE (by typing startx) gives a hanging KDE screen. Changing
to 'term 1' then shows again the "LSR Safety check engaged!" message.
Running gpm -t ms -m /dev/ttyS0 (as I have a microsoft compatible mouse
on 'COM1') also gives the message, and the prompt only returns when Ctrl-C
This appears to be a 'serial driver' problem with some UART 16550A chips
(which appear to have). I have no PS2 port, so I've got no workaround
here. Please help.
Looking in Google under "LSR Safety check engaged" shows that a lot of
pple have the same problem....
I haven't fount the remedy though on the web.
grepping the source tree shows this message is generated by the kernel when it
finds an extremely buggy UART chipset. (linux/drivers/char/serial.c)
There's nothing gpm can do about it; if it can be fixed, it can be fixed in the
serial driver. Assigning.
Thanks for the bug report. However, Red Hat no longer maintains this version of
the product. Please upgrade to the latest version and open a new bug if the problem
The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases,
and if you believe this bug is interesting to them, please report the problem in
the bug tracker at: http://bugzilla.fedora.us/