*** UPDATE - YOU CAN POSSIBLY AVOID EXTRA CONFIGURATION OF THIS COMMENT BY USING LIBINPUT DRIVER - SEE COMMENT AFTER THIS ONE ***
Linux keyboard configuration seems to be complicated and ever changing, and I found the xmodmap method no longer effective.
But Xkbcomp allowed me to get my USB keyboard keys working on my Kobo:
To get current keyboard config:
apk add xkbcomp
xkbcomp $DISPLAY old.xkb
Copy the old keyboard layout, just in case we mess up:
cp old.xkb new.xkb
Now, for each malfunctioning key(Column1 below), get the keycodes(Column2) and their misassigned function(Column3):
apk add xev
xev -event keyboard
(Get the codes by clicking each key):
Right : 114, NoSymbol
Up : 111, Print
Left : 113, Alt_R
Down : 116, Super_R
Print : 107, Delete
Alt_R : 108, KP_Enter
Menu : 135, No_Symbol
PgUp : 112, KP_Divide
PgDn : 117, Menu
Home : 110, Pause
End : 115, Super_L
Scroll: 78, Scroll_Lock
Pause : 127, NoSymbol
Insert: 118, NoSymbol
Delete: 119, Nosymbol
Now open the keyboard layout file and find in the "xkb_keycodes" section the aliases(Column1 below) assigned to refer to each keycode(Column3 below) that our keyboard gave us:
mc -bv new.xkb
BRK :Right : 114, NoSymbol
PRSC :Up : 111, Print
RALT :Left : 113, Alt_R
RWIN : Down : 116, Super_R
DELE :Print : 107, Delete
KPEN :Alt_R : 108, KP_Enter
I07 :Menu : 135, No_Symbol
KPDV :PgUp : 112, KP_Divide
MENU :PgDn : 117, Menu
PAUS :Home : 110, Pause
LWIN :End : 115, Super_L
SCLK :Scroll: 78, Scroll_Lock
SUPR :Pause : 127, NoSymbol
FK13 :Insert: 118, NoSymbol
FK14 : Delete: 119, Nosymbol
As you see, some of our malfunctioning keys have already assigned functions (Column4 above), but none are essential, so we will comment them out in the "xkb_symbols" section, where the functions are assigned (but DO NOT edit anything in the"xkb_keycodes" section):
nano new.xkb
Do a Ctrl-W search for each of the misassigned key code aliases above(Column1) to comment them out, IN THE "xkb_symbols" SECTION ONLY:
BRK : Nothing to comment out (Unassigned, NoSymbol)
PRSC: Comment out:
// Key <PRSC> {
// ...
// };
RALT : Comment out:
// Key <RALT> {[ Alt_R, Meta_R ]};
RWIN : Comment out:
// Key <RWIN> {[ Super_R ]};
DELE : Comment out:
// Key <DELE> {[ Delete ]};
KPEN : Comment out:
// Key <KPEN> {[ KP_Enter ]};
I07 : Nothing to comment out (Unassigned, NoSymbol)
KPDV : Comment out:
// Key <KPDV> {
// ...
// ;
MENU : Comment out:
// Key <MENU> {[ Menu ]};
PAUS : Comment out:
// Key <PAUS> {
// ...
// ;
LWIN : Comment out:
// Key <LWIN> {[ Super_L ]};
SCLK : Comment out:
// Key <SCLK> {[ Scroll_Lock ]};
SUPR: Nothing to comment out (Unassigned, NoSymbol)
FK13: Nothing to comment out (Unassigned, NoSymbol)
FK14 : Nothing to comment out (Unassigned, NoSymbol)
Phew! Do a Ctrl-O Save!
Now, we will just replace in the "xkb_keycodes" section the default alias names(Column1) with the aliases our keys gave us(Column3) :
HOME : 97 : PAUS
UP : 98 : PRSC
PGUP : 99 : KPDV
LEFT : 100 : RALT
RGHT : 102 : BRK
END : 103 : LWIN
DOWN : 104 : RWIN
PGDN : 105 : MENU
INS : 106 : FK13
DELE : 107 : FK14
Change "key <HOME> {[ Home ]};" to "key <PAUS> {[ Home ]};"
Change "key <I2C> {[ Up ]};" to "key <PRSC> {[ Up ]};"
Change "key <PGUP> {[ Prior]};" to "key <KPDV> {[ Prior]};"
Change "key <I10> {[ Left ]};" to "key <RALT> {[ Left, Left ]};"
Change "key <I19> {[ Right ]};" to "key <BRK> {[ Right ]};"
Change "key <END> {[ End ]};" to "key <LWIN> {[ End ]};"
Change "key <I2E> {[ Down ]};" to "key <RWIN> {[ Down ]};"
Change "key <PGDN> {[ Next ]};" to "key <MENU> {[ Next ]};"
Change "key <INS> {[ Insert]};" to "key <FK13> {[ Insert ]};"
Change "key <DELE> {[ Delete ]};" to "key <FK14> {[ Delete ]};"
Do a Ctrl-O Save , Ctrl-X exit, and load up the keymap:
xkbcomp new.xkb $DISPLAY