setkeycodes(8) - phpMan

SETKEYCODES(8)                           Keyboard Support                          SETKEYCODES(8)



NAME
       setkeycodes - load kernel scancode-to-keycode mapping table entries

SYNOPSIS
       setkeycodes scancode keycode ...

DESCRIPTION
       The setkeycodes command reads its arguments two at a time, each pair of arguments consist-
       ing of a scancode (given in hexadecimal) and a keycode (given in decimal). For  each  such
       pair,  it  tells the kernel keyboard driver to map the specified scancode to the specified
       keycode.

       This command is useful only for people with slightly unusual keyboards, that  have  a  few
       keys which produce scancodes that the kernel does not recognize.


THEORY
       The  usual  PC keyboard produces a series of scancodes for each key press and key release.
       (Scancodes are shown by showkey -s, see showkey(1).)  The kernel  parses  this  stream  of
       scancodes,  and converts it to a stream of keycodes (key press/release events).  (Keycodes
       are shown by showkey.)  Apart from a few scancodes with special meaning,  and  apart  from
       the  sequence  produced by the Pause key, and apart from shiftstate related scancodes, and
       apart from the key up/down bit, the stream of scancodes consists of unescaped scancodes xx
       (7  bits) and escaped scancodes e0 xx (8+7 bits).  To these scancodes or scancode pairs, a
       corresponding keycode can be assigned (in the range 1-127).  For example, if  you  have  a
       Macro key that produces e0 6f according to showkey(1), the command
              setkeycodes e06f 112
       will assign the keycode 112 to it, and then loadkeys(1) can be used to define the function
       of this key.

       USB keyboards have standardized keycodes and setkeycodes doesn't affect them at all.

       Some older kernels might hardwire a low scancode range to the equivalent keycodes; setkey-
       codes will fail when you try to remap these.


2.6 KERNELS
       In  2.6  kernels key codes lie in the range 1-255, instead of 1-127.  (It might be best to
       confine oneself to the range 1-239.)

       In 2.6 kernels raw mode, or scancode mode, is not very raw at all.  The code  returned  by
       showkey -s will change after use of setkeycodes.  A kernel bug. See also showkey(1).

OPTIONS
       None.

BUGS
       The  keycodes of X have nothing to do with those of Linux.  Unusual keys can be made visi-
       ble under Linux, but not under X.

       setkeycodes affects only the "first" input device that has modifiable  scancode-to-keycode
       mapping.   If there is more than one such device, setkeycodes cannot change the mapping of
       other devices than the "first" one.


SEE ALSO
       dumpkeys (1), loadkeys (1), showkey (1), getkeycodes (8)





Local                                       8 Nov 1994                             SETKEYCODES(8)

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