Most recent kernel where this bug did not occur: occur since kernel 2.6
Distribution: RedHat
Hardware Environment: POS (Point of Sell), all from WincorNixdorf, with keyboard TA61100001
Software Environment: Does not matter
Problem Description:
In drivers/input/keyboard/atkbd.c about line 535, there is this part of code:

/*
 * If the get ID command failed, we check if we can at least set the LEDs on
 * the keyboard. This should work on every keyboard out there. It also turns
 * the LEDs off, which we want anyway.
 */
                param[0] = 0;
                if (atkbd_command(atkbd, param, ATKBD_CMD_SETLEDS))
                        return -1;
                atkbd->id = 0xabba;
                return 0;
        }


That 'if' with the keyboard model TA61100001 of WincorNixdorf fail, so returns -1 and the driver is not set. In this case, when you push a key, it is not recognized, you must push it at least two times quickly to get one key.

Our temporary solution is comment that 'if'.

Steps to reproduce:

Boot the machine with a 2.6 kernel and the problematic keyboard connected. At the moment you change the keyboard with other wich works, and then returns to the problematic, its works