Can I change the keycodes on a keyboard?

Question

I have a Lenovo notebook with a nonstandard keyboard layout in which there's a slash/question (/?) key next to the righthand Shift, that by br-abnt2 default was mapped to apostrophe/quote ('"). There's also a standard apostrophe/quote key next to 1. Yesterday I changed my br-abnt.map and my xorg layout files so as to fix the /? key. Then I realized the '" now was mapped to /?.

Today I tested these two keys with xev and they have the same keycode, so I can/t fix one without messing up the other.

Is it possible to change the keycodes on these keys so that they can be configured separatedly? How can I fix this?

EDIT: here's the evtest output for pressin first '" then /?:

Properties: Testing ... (interrupt to exit) Event: time 1525650895.009067, type 4 (EV_MSC), code 4 (MSC_SCAN), value 1c Event: time 1525650895.009067, type 1 (EV_KEY), code 28 (KEY_ENTER), value 0 Event: time 1525650895.009067, -------------- SYN_REPORT ------------ Event: time 1525650897.410587, type 4 (EV_MSC), code 4 (MSC_SCAN), value 29 Event: time 1525650897.410587, type 1 (EV_KEY), code 41 (KEY_GRAVE), value 1 Event: time 1525650897.410587, -------------- SYN_REPORT ------------ 'Event: time 1525650897.466550, type 4 (EV_MSC), code 4 (MSC_SCAN), value 29 Event: time 1525650897.466550, type 1 (EV_KEY), code 41 (KEY_GRAVE), value 0 Event: time 1525650897.466550, -------------- SYN_REPORT ------------ Event: time 1525650908.301683, type 4 (EV_MSC), code 4 (MSC_SCAN), value 29 Event: time 1525650908.301683, type 1 (EV_KEY), code 41 (KEY_GRAVE), value 1 Event: time 1525650908.301683, -------------- SYN_REPORT ------------ 'Event: time 1525650908.411541, type 4 (EV_MSC), code 4 (MSC_SCAN), value 29 Event: time 1525650908.411541, type 1 (EV_KEY), code 41 (KEY_GRAVE), value 0 Event: time 1525650908.411541, -------------- SYN_REPORT ------------

(the first SYN_REPORT is before I type either)

Answer 1

Use evtest to find out how the kernel sees them. If they have different scancodes, the kernel input layer can map them to different keycodes, for example using the udev hwdb.