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diff -up kbd-2.3.0/docs/man/man1/showkey.1.orig kbd-2.3.0/docs/man/man1/showkey.1
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--- kbd-2.3.0/docs/man/man1/showkey.1.orig 2020-07-08 19:25:47.000000000 +0200
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+++ kbd-2.3.0/docs/man/man1/showkey.1 2020-07-16 08:56:15.970254183 +0200
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@@ -84,6 +84,19 @@ corresponds to what the keyboard hardwar
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to know the scan codes sent by various keys it is better to boot a
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2.4 kernel. Since 2.6.9 there also is the boot option atkbd.softraw=0
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that tells the 2.6 kernel to return the actual scan codes.
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+
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+.SH NOTES
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+The raw scan codes are available only on AT and PS/2 keyboards,
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+and even then they are disabled unless the
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+.B atkbd.softraw=0
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+kernel parameter is used.
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+When the raw scan codes are not available, the kernel uses a fixed built-in
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+table to produce scan codes from keycodes. Thus,
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+.BR setkeycodes (8)
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+can affect the output of
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+.B showkey
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+in scan code dump mode.
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+
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.SH "SEE ALSO"
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.BR loadkeys (1),
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.BR dumpkeys (1),
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diff -up kbd-2.3.0/docs/man/man8/setkeycodes.8.orig kbd-2.3.0/docs/man/man8/setkeycodes.8
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--- kbd-2.3.0/docs/man/man8/setkeycodes.8.orig 2020-07-08 19:35:35.000000000 +0200
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+++ kbd-2.3.0/docs/man/man8/setkeycodes.8 2020-07-16 08:57:52.293900997 +0200
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@@ -42,6 +42,10 @@ the command
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will assign the keycode 112 to it, and then
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.BR loadkeys (1)
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can be used to define the function of this key.
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+
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+USB keyboards have standardized keycodes and
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+.B setkeycodes
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+doesn't affect them at all.
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.LP
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Some older kernels might hardwire a low scancode range to the
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equivalent keycodes; setkeycodes will fail when you try to remap
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@@ -60,6 +64,14 @@ None.
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.SH BUGS
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The keycodes of X have nothing to do with those of Linux.
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Unusual keys can be made visible under Linux, but not under X.
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+
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+.B setkeycodes
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+affects only the "first" input device
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+that has modifiable scancode-to-keycode mapping.
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+If there is more than one such device,
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+.B setkeycodes
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+cannot change the mapping of other devices than the "first" one.
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+
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.SH "SEE ALSO"
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.BR dumpkeys (1),
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.BR loadkeys (1),
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