我在我的戴尔xps 9370上重新映射Fn键时出现问题。软件：Arch linux + Wayland。我想重新设置亮度上/下键以向上/向下翻页，但我找不到他们的扫描码。这是showkey的输出，带有按下的brig up键：
#>> showkey --scancodes
kb mode was ?UNKNOWN?
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]
press any key (program terminates 10s after last keypress)...
0x9c
0xe0 0x54 0xe0 0xd4
evtest的输出：
#>> evtest /dev/input/event13
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x0 product 0x6 version 0x0
Input device name: "Video Bus"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 224 (KEY_BRIGHTNESSDOWN)
Event code 225 (KEY_BRIGHTNESSUP)
Event code 227 (KEY_SWITCHVIDEOMODE)
Event code 241 (KEY_VIDEO_NEXT)
Event code 242 (KEY_VIDEO_PREV)
Event code 243 (KEY_BRIGHTNESS_CYCLE)
Event code 244 (KEY_BRIGHTNESS_ZERO)
Event code 245 (KEY_DISPLAY_OFF)
Properties:
Testing ... (interrupt to exit)
Event: time 1523197124.754306, type 1 (EV_KEY), code 225 (KEY_BRIGHTNESSUP), value 1
Event: time 1523197124.754306, -------------- SYN_REPORT ------------
Event: time 1523197124.754340, type 1 (EV_KEY), code 225 (KEY_BRIGHTNESSUP), value 0
Event: time 1523197124.754340, -------------- SYN_REPORT ------------
我的hwdb文件是这样的：
evdev:*
KEYBOARD_KEY_d4=pageup
我试过'd4,53，oe54,54d4'和其他扫描码，没什么用。使用其他键都可以正常工作，重新映射成功。我怎么能找到这个键的实际扫描码？