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<TITLE>The Answer Guy 34:
Conflict: Num-Lock, X Window Managers, and pppd
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<H4>"Linux Gazette...<I>making Linux just a little more fun!</I>"
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<H4 align="center">By James T. Dennis,
<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a>
<BR>Starshine Technical Services, <A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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<H3><img src="../../gx/dennis/qbub.gif" alt="(?)"
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>Conflict: Num-Lock, X Window Managers, and pppd</H3>
<p><strong>From Victor J. McCoy on 11 Oct 1998 </strong></p>
<!-- begin body -->
<p><strong>Please publish this. After the original question, I received a
number of inquiries indicating that I'm not the only one with this
problem.
</strong></p>
<p><strong>Last year <a href="http://www.linuxgazette.com/issue22/issue22.html">LG22</a> (Oct97) I asked a question regarding window manager
and pppd anomaly.
</strong></p>
<p><strong>Quick answer: Num-Lock key activation.
</strong></p>
<p><strong>Long answer:
</strong></p>
<p><strong>I finally got fed up with the problem, so I tore my machine apart,
down to a single SCSI controller (with only my root drive),
keyboard, modem.
</strong></p>
<p><strong>The problem continued. I upgraded to redhat 5.0 since, and the
problem persisted, different Window managers also exhibit problems
(just differently). I even changed to <A HREF="http://www.caldera.com/">Caldera</A> lite 1.2, and I
still had the problem.
</strong></p>
<p><strong>Believe it or not, it turned out to be my NUM-LOCK key. If NL is
active, then the WM screws up EVERY TIME; different WMs just screw
up differently. I would turn on Num-lock to ping a host IP addr
and that would be all it took.
</strong></p>
<p><strong>I have a MS natural keyboard (Of all the products MS has, software
sucks, but I love the hardware [KB and Mouse].) I'm sure that's
not the problem, because I've only recently acquired the KB and
the problem has been around for a couple of years.
</strong></p>
<p><strong>I would like to know if this is a widespread problem. Surely, I'm
not one of very few people to use the numeric keypad.
</strong></p>
<p><strong>Victor J. McCoy
</strong></p>
<blockquote><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)" height="28" width="50" align="bottom">I'll just let this message speak for itself. I'm
not really sure what it's saying but it sounds like
a call for other people to do some testing. What happens
if you have your NumLock key active when you start up and
user your ppp link from within an X session.
</blockquote>
<blockquote>As for ways to try to alleviate the problem:
</blockquote>
<ul>
<li>Change to a newer (2.1.x) kernel <EM>and</EM> a
new pppd (must do that to use PPP under the
new kernels anyway).
<li>Try a different X server. If you're currentlly
using XFree86, consider tying <a href="http://www.xig.com/">Xig</a> or <a href="http://www.metrolink.com/productindex.html">Metro-X</a>
(one of the commercial X suites for Linux).
</ul>
<blockquote>... I don't know of good ways to troubleshoot or isolate
this, off hand. Look in your syslog (<tt>/var/log/messages</tt>)
for "ooops" or similar messages from the kernel. Try
strace on the X server and the window managers, the pppd
(also run it under full debugging and kdegug). Try adding
<tt>ipfwadm</tt> (or <tt>ipchains</TT>) rules with the <tt>-o</tt> switch (to "output"
details of every packet to your syslogs). You could also
capture <tt>tcpdump</tt>'s from the <tt>ppp0</tt> interface during the whole
affair.
</blockquote>
<blockquote>It's probably something specific to your hardware --- since
you've changed your software completely. I'll be curious
if you can isolate the problem to a specific library
function or system call.
</blockquote>
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<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
>Copyright ©</a> 1998, James T. Dennis <BR>
Published in <I>Linux Gazette</I> Issue 34 November 1998</H5>
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