Here is the summary concerning the console display that hangs
on a SS20 with Solaris 2.4
Thanks to all of you who gave me the following possibilities.
I- 
It also happened to me.  However, you don't need to reboot.  Login from 
another machine and do the followin command
         /usr/openwin/bin/kbd_mode -a
When killing the window manager try using this command:
kill -9 `ps -auxww | grep mwm | grep -v grep | awk '{print $2}'`
Note:  ps -auxww is BSD.  to use ps in BSD mode just type /usr/ucb/ps
mwm is the Motif window manager.  Replace this with the window 
 manager that you are using.
from    ruiz@babbage.csee.usf.edu (Pablo Ruiz)
        poffen@San-Jose.ate.slb.com
        manjeet@Cadence.com
        met@leis.bellcore.com
        vlau@msmail2.hac.com
II-
There is a known problem with OpenWin under Sol2.4 - sometimes the mouse
cursor goes away, giving the impression of a system freeze.  The patch
for this problem is 101933-01.  It's not in the standard patch set, but
all the 2.4 systems (Sparc10s mostly) I know have needed it.
from jonsg@hyphen.com
III-
try either:
kbd_mode -a or -e
from hkatz@lehman.com
IV-
We have seen this a number of times.  Try entering <CTL> C when
trying to re - login.  This brings up the login as per normal.  It
works for us.
from steve@BarwonWater.Vic.Gov.Au
V- 
Add something to run "kbd -r" after X-windows exits to get out of raw 
mode. Alternately (works under SunOS) telnet in and then run kbd.
from Darren FV Admin mail
VI- The strange characters is due to a baud rate mismatch...ttymon messedup.
Sometime a control-C will fix it....otherwise rlogin/telnet and kill the process
/usr/lib/saf/ttymon.  It will produce a new and hopefully better one.
from epl@Kodak.COM
-- Marc LeMaire E-mail: marc.lemaire@CCG.RNCan.gc.ca Administrateur de systemes Unix Tel: (819) 564-5600 ext.4851 Centre Canadien de Geomatique Fax: (819) 564-5698 2144 King Ouest, suite 010, Sherbrooke, Quebec, Canada, J1J 2E8
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