Console keyboard locks up
When the system does not respond
to input from the console keyboard,
the situation is known as ``keyboard lockup.''
Console keyboard lockup only affects keyboards that
are attached to the computer's console,
not standard terminals that are attached to serial lines.
You may be experiencing keyboard lockup if all these
statements are true:
Before trying to fix a locked keyboard, make sure that:
The system console keyboard cannot be used to enter data
or perform any tasks.
You cannot switch multiscreens,
and the <CapsLock> key does not turn the CapsLock light on or off.
Other terminals on the system continue to work.
Printers or other devices continue to work, and
the system is still running.
you did not accidentally press <Ctrl>S
(which stops the screen from scrolling).
To check this, press <Ctrl>Q and then see if you
can enter characters from the keyboard.
if your computer has a Keyboard Lock key,
it is not in the locked position.
the keyboard is plugged into the correct socket.
the system itself is still running.
Check a terminal to see if it is still working and that you
can perform system tasks, such as logging in and checking the date.
If you do not have a terminal, watch the hard disk access light
(if your computer has one).
If you are in single-user mode, you cannot use other terminals
and the hard disk access light may not flash.
If it flashes periodically (at least once every 30 seconds),
the system is still running and is using the hard disk.
Unplugging the keyboard and reconnecting it while the system is
powered up can damage some computers.
If the console keyboard is still locked after checking these suggestions,
try unplugging the console keyboard and plugging it in again.
If this fixes the problem, your situation is definitely keyboard lockup.
If this last step does not fix the problem, you may still have keyboard lockup.
Preventing console keyboard lockup
You can prevent keyboard lockup by applying a special
``patch'' that changes the operating system kernel.
This patch disables the keyboard lights, so you should use it
only if you have tried the other approaches.
To prevent console keyboard lockup:
Get the system console working, if it is not.
If necessary, reboot the system and bring it up in single-user mode
by entering the root password at the
If you did not reboot, log in as root on the system console
and shut the system down to single-user mode with the
Once the system is in single-user mode, enter these commands:
This unmounts the /stand filesystem (which is normally
mounted read-only) and remounts it so that you can make modifications.
Back up the kernel with these commands:
cp unix unix.00
Patch the kernel with these commands:
/etc/_fst -w /unix
Shut down the system using /etc/shutdown.
When you see the
Normal System Shutdown message, press any key
to reboot the system.
You have now fixed the keyboard lockup problem.
Confirm that the keyboard is functioning normally. If you
have no problems, you should now apply this fix permanently:
copy -om Driver.o Driver.o.save
/etc/_fst -w Driver.o
Wrong console keyboard type
If your console keyboard is an
XT or other non-AT keyboard and the operating
system is configured for use with an AT
keyboard, the system does not recognize input from the keyboard.
For information on testing and switching keyboard modes, see
``Setting the console keyboard type''.
Cannot log into console
System hangs at boot time
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003