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desaster/remap-capslock-ctrl.md

Last active August 27, 2023 21:04
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remapping capslock to ctrl at low level in Linux
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remap-capslock-ctrl.md

do the following in console, not X11

Prepare

# evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event4:      AT Translated Set 2 keyboard

# evtest /dev/input/event4                                                                            

Input driver version is 1.0.1                                                                                                            
Input device ID: bus 0x11 vendor 0x1 product 0x1 version 0xab41                                                                          

Event: time 1630747582.938161, type 4 (EV_MSC), code 4 (MSC_SCAN), value 3a
Event: time 1630747582.938161, type 1 (EV_KEY), code 58 (KEY_CAPSLOCK), value 0

Setup

/lib/udev/hwdb.d/90-keyboard-changes.hwdb:

evdev:input:b0011v0001p0001*
  KEYBOARD_KEY_3a=leftctrl

# systemd-hwdb -s update
# udevadm trigger /dev/input/event4

Test

# evtest /dev/input/event4

Event: time 1630751006.715770, type 4 (EV_MSC), code 4 (MSC_SCAN), value 3a
Event: time 1630751006.715770, type 1 (EV_KEY), code 29 (KEY_LEFTCTRL), value 1
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