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_tmkc

Member

Registered: 2025-03-03

Posts: 6

[SOLVED] Trouble mapping scancodes to keycodes

I have a wireless keyboard and all of the  F1-F12 are mapped to "other actions" like volume setting, skip song etc.
I managed to get respective MSC_SCAN scan codes using evtest. eg:

Event: time 1741027689.141429, type 4 (EV_MSC), code 4 (MSC_SCAN), value 70045
Event: time 1741027689.141429, type 1 (EV_KEY), code 115 (KEY_VOLUMEUP), value 1
Event: time 1741027689.141429, -------------- SYN_REPORT ------------

I created a file in /etc/udev/hwdb.d/ with following entry:

evdev:name:Thock 75% Wireless:*
 KEYBOARD_KEY_70045=f12

Updated hwdb.bin using systemd-hwdb, and udevadm trigger.

It didnt change anything.
However if I bind 70045 to 'a' or any letter it works. Now F12 will return 'a' character.

dumpkeys doesn't report mapping for code 115, but shows

string F12 = "\033[24~"

I must be missing something.

I would appreciate any help.
Thank you

Last edited by _tmkc (2025-03-03 23:06:45)

_tmkc

Member

Registered: 2025-03-03

Posts: 6

Re: [SOLVED] Trouble mapping scancodes to keycodes

I was helped through other channels.

This article describes issue and a solution: https://fcastagnotto.wordpress.com/2024 … gnu-linux/

Relevant wiki article: https://wiki.archlinux.org/title/Apple_Keyboard

Last edited by _tmkc (2025-03-03 23:11:51)