Date: Tue, 3 Dec 2002 22:10:57 -0400 (AST) From: Pierre-Paul Lavoie <ppl@nbnet.nb.ca> To: FreeBSD-gnats-submit@FreeBSD.org Subject: docs/45981: Printer setup documentation: Running dmesg weeks after boot up Message-ID: <20021204021057.93EF5EA5@bloodaxis.dyndns.org>
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>Number: 45981
>Category: docs
>Synopsis: Printer setup documentation: Running dmesg weeks after boot up
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: doc-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Dec 03 18:20:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Pierre-Paul Lavoie
>Release: FreeBSD 4.7-RELEASE-p1 i386
>Organization:
>Environment:
System: FreeBSD bloodaxis 4.7-RELEASE-p1 FreeBSD 4.7-RELEASE-p1 #0: Fri Nov 8 20:48:41 AST 2002 root@bloodaxis:/usr/obj/usr/src/sys/BLOODAXIS i386
>Description:
Taken from FreeBSD handbook printing section 11.3.1.2.1
(Kernel Configuration):
<snip>
To find out if the kernel you are currently using supports a serial
interface, type:
# dmesg | grep sioN
</snip>
If it have been a while that the operating system is boot up,
original messages might have been silently discarded. As a result,
the user will not get any output from the above command.
Maybe `cat /var/run/dmesg.boot' should be use instead of dmesg(1)?
It is uglier, but have the advantage of beeing guaranteed to work
(I think). Or perhaps add a new -b(oot) option to dmesg(1) that
simply echo back `dmesg.boot'.
I believe that it would be a good thing to warn about this potential
pitfall.
>How-To-Repeat:
Go to
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/printing-intro-setup.html#PRINTING-SIMPLE
section 11.3.1.2.1 Kernel Configuration
>Fix:
Mention `cat /var/run/dmesg.boot` instead of dmesg if it
have been a while that you have boot up.
>Release-Note:
>Audit-Trail:
>Unformatted:
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